画面のハードコピーを取る際は、PrintScreen（Prt Scr / プリントスクリーン）キーを使います。
Fedora 28 では、インストール直後だと PrintScreen キーを押下するとエラーになります。
以下を参考にしてみました。
# dnf install gnome-utils
一致した引数がありません: gnome-utils
エラー: 一致するものが見つかりません
無いものはしょうがないので、検索してみました。
# dnf search gnome-
================================================================= 概要 & 名前 の一致: gnome- =================================================================
gnome-photos-tests.x86_64 : Tests for gnome-photos
gnome-vfs2-common.noarch : Common files for gnome-vfs2
gnome-colors-icon-theme.noarch : GNOME-Colors icon theme
gnome-builder.i686 : IDE for writing GNOME-based software
gnome-builder.x86_64 : IDE for writing GNOME-based software
falkon-gnome-keyring.i686 : gnome-keyring plugin for falkon
falkon-gnome-keyring.x86_64 : gnome-keyring plugin for falkon
gnome-autoar-devel.i686 : Development files for gnome-autoar
gnome-autoar-devel.x86_64 : Development files for gnome-autoar
gnome-guitar-devel.i686 : Development files for gnome-guitar
gnome-guitar-devel.x86_64 : Development files for gnome-guitar
gnome-session-xsession.x86_64 : Desktop file for gnome-session
gnome-shell-theme-selene.noarch : The Selene gnome-shell theme
gnome-vfs2-smb.x86_64 : Windows fileshare support for gnome-vfs
gnome-builder-devel.i686 : Development files for gnome-builder
gnome-builder-devel.x86_64 : Development files for gnome-builder
gnome-themes-legacy.noarch : Old names for icons in gnome-themes
gnome-weather-tests.noarch : Tests for the gnome-weather package
gnome-desktop3-tests.x86_64 : Tests for the gnome-desktop3 package
gnome-js-common-devel.noarch : Development files for gnome-js-common
gnome-desktop3-devel.i686 : Libraries and headers for gnome-desktop3
gnome-desktop3-devel.x86_64 : Libraries and headers for gnome-desktop3
gnome-icon-theme-devel.noarch : Development files for gnome-icon-theme
gnome-keyring-sharp-doc.x86_64 : Documentation for gnome-keyring-sharp
libgnome-keyring-devel.i686 : Development files for libgnome-keyring
libgnome-keyring-devel.x86_64 : Development files for libgnome-keyring
gnome-desktop-devel.i686 : Libraries and headers for libgnome-desktop
gnome-desktop-devel.x86_64 : Libraries and headers for libgnome-desktop
gnome-sharp-devel.i686 : Files needed for developing with gnome-sharp
gnome-sharp-devel.x86_64 : Files needed for developing with gnome-sharp
gnome-icon-theme-legacy.noarch : Old names for icons in gnome-icon-theme
gnome-desktop-sharp-devel.i686 : Developing files for gnome-Desktop-sharp
gnome-desktop-sharp-devel.x86_64 : Developing files for gnome-Desktop-sharp
gnome-packagekit-common.x86_64 : Common files required for gnome-packagekit
gnome-doc-utils-stylesheets.noarch : XSL stylesheets used by gnome-doc-utils
gnome-keyring-sharp-devel.i686 : Development files for gnome-keyring-sharp
gnome-keyring-sharp-devel.x86_64 : Development files for gnome-keyring-sharp
gnome-bluetooth-libs-devel.i686 : Development files for gnome-bluetooth-libs
gnome-bluetooth-libs-devel.x86_64 : Development files for gnome-bluetooth-libs
gnome-python2-gnomevfs.x86_64 : Python bindings for interacting with gnome-vfs
gnome-shell-extension-iok.noarch : A gnome-shell extension for iok application
gnome-online-accounts-devel.i686 : Development files for gnome-online-accounts
gnome-online-accounts-devel.x86_64 : Development files for gnome-online-accounts
gnome-settings-daemon-devel.i686 : Development files for gnome-settings-daemon
gnome-settings-daemon-devel.x86_64 : Development files for gnome-settings-daemon
gnome-documents-libs.x86_64 : Common libraries and data files for gnome-documents
gnome-software-devel.i686 : Headers for building external gnome-software plugins
gnome-software-devel.x86_64 : Headers for building external gnome-software plugins
gnome-desktop.i686 : Shared code among gnome-panel, gnome-session, nautilus, etc
gnome-desktop.x86_64 : Shared code among gnome-panel, gnome-session, nautilus, etc
libgnome-games-support-devel.i686 : Development files for libgnome-games-support
libgnome-games-support-devel.x86_64 : Development files for libgnome-games-support
gnome-desktop3.i686 : Shared code among gnome-panel, gnome-session, nautilus, etc
gnome-desktop3.x86_64 : Shared code among gnome-panel, gnome-session, nautilus, etc
gnome-python2-gnomedesktop.x86_64 : Python bindings for interacting with gnome-desktop
gnome-python2-gnomekeyring.x86_64 : Python bindings for interacting with gnome-keyring
gnome-getting-started-docs-cs.noarch : Czech translations for gnome-getting-started-docs videos
gnome-getting-started-docs-de.noarch : German translations for gnome-getting-started-docs videos
gnome-getting-started-docs-fr.noarch : French translations for gnome-getting-started-docs videos
gnome-getting-started-docs-pl.noarch : Polish translations for gnome-getting-started-docs videos
gnome-getting-started-docs-es.noarch : Spanish translations for gnome-getting-started-docs videos
gnome-getting-started-docs-it.noarch : Italian translations for gnome-getting-started-docs videos
gnome-getting-started-docs-ru.noarch : Russian translations for gnome-getting-started-docs videos
gnome-getting-started-docs-gl.noarch : Galician translations for gnome-getting-started-docs videos
gnome-getting-started-docs-hu.noarch : Hungarian translations for gnome-getting-started-docs videos
gnome-shell-extension-remove-volume-icon.noarch : A gnome-shell extension for removing the volume icon
gnome-shell-extension-fedmsg.noarch : A gnome-shell extension for enabling fedmsg desktop notifications
gnome-shell-extension-remove-bluetooth-icon.noarch : A gnome-shell extension for removing the bluetooth icon
gnome-getting-started-docs-pt_BR.noarch : Brazilian Portuguese translations for gnome-getting-started-docs videos
==================================================================== 名前 の一致: gnome- =====================================================================
gnome-do.x86_64 : Quick launch and search
gnome-mud.x86_64 : A MUD client for GNOME
gnome-pie.x86_64 : A visual application launcher for Gnome
gnome-rdp.x86_64 : Remote Desktop Protocol client for the GNOME desktop environment
gnome-vfs2.x86_64 : The GNOME virtual file-system libraries
gnome-logs.x86_64 : Log viewer for the systemd journal
gnome-maps.x86_64 : Map application for GNOME
gnome-2048.x86_64 : A 2048 clone for GNOME
gnome-abrt.x86_64 : A utility for viewing problems that have occurred with the system
gnome-libs.i686 : The main GNOME1 libraries
gnome-libs.x86_64 : The main GNOME1 libraries
gnome-todo.x86_64 : Personal task manager for GNOME
gnome-vfs2.i686 : The GNOME virtual file-system libraries
gnome-boxes.x86_64 : A simple GNOME 3 application to access remote or virtual systems
gnome-music.x86_64 : Music player and management application for GNOME
gnome-shell.x86_64 : Window management and application launching for GNOME
gnome-books.x86_64 : A e-books manager application for GNOME
gnome-chess.x86_64 : GNOME Chess game
gnome-gmail.noarch : Integrate GMail into the GNOME desktop
gnome-menus.i686 : A menu system for the GNOME project
gnome-menus.x86_64 : A menu system for the GNOME project
gnome-mines.x86_64 : GNOME Mines Sweeper game
gnome-sharp.x86_64 : GTK+ and GNOME bindings for Mono
gnome-usage.x86_64 : A GNOME app to view information about use of system resources
gnome-themes.noarch : Themes for GNOME
gnome-autoar.i686 : Archive library
gnome-autoar.x86_64 : Archive library
gnome-clocks.x86_64 : Clock application designed for GNOME 3
gnome-common.noarch : Useful things common to building GNOME packages from scratch
gnome-genius.x86_64 : GNOME frontend for Genius
gnome-guitar.x86_64 : A small suite of applications for the guitarist
gnome-hearts.x86_64 : Hearts game for GNOME
gnome-photos.x86_64 : Access, organize and share your photos on GNOME
gnome-robots.x86_64 : GNOME Robots game
gnome-sudoku.x86_64 : GNOME Sudoku game
gnome-taquin.x86_64 : Sliding-block puzzle game
gnome-tweaks.noarch : Customize advanced GNOME 3 options
gnome-keyring.x86_64 : Framework for managing passwords and other secrets
gnome-keyring.i686 : Framework for managing passwords and other secrets
gnome-klotski.x86_64 : GNOME Klotski game
gnome-nettool.x86_64 : Network information tool for GNOME
gnome-nibbles.x86_64 : GNOME Nibbles game
gnome-python2.i686 : PyGNOME Python extension module
gnome-python2.x86_64 : PyGNOME Python extension module
gnome-session.x86_64 : GNOME session manager
gnome-weather.noarch : A weather application for GNOME
gnome-calendar.x86_64 : Simple and beautiful calendar application designed to fit GNOME 3
gnome-contacts.x86_64 : Contacts manager for GNOME
gnome-software.i686 : A software center for GNOME
gnome-software.x86_64 : A software center for GNOME
gnome-do-devel.i686 : Development files for GNOME Do
gnome-do-devel.x86_64 : Development files for GNOME Do
gnome-mahjongg.x86_64 : GNOME Mahjongg game
gnome-terminal.x86_64 : Terminal emulator for GNOME
gnome-tetravex.x86_64 : GNOME Tetravex game
libgnome-devel.i686 : Libraries and headers for libgnome
libgnome-devel.x86_64 : Libraries and headers for libgnome
gnome-user-docs.noarch : GNOME User Documentation
gnome-bluetooth.i686 : Bluetooth graphical utilities
gnome-bluetooth.x86_64 : Bluetooth graphical utilities
gnome-commander.x86_64 : A nice and fast file manager for the GNOME desktop
gnome-doc-utils.noarch : Documentation utilities for GNOME
gnome-documents.x86_64 : A document manager application for GNOME
gnome-js-common.noarch : Common modules for GNOME JavaScript interpreters
gnome-mime-data.noarch : MIME type data files for GNOME desktop
gnome-pkg-tools.noarch : Tools for the Debian GNOME Packaging Team
gnome-subtitles.x86_64 : Subtitle editor for Gnome
gnome-translate.x86_64 : GNOME interface to libtranslate -- Natural language translator
gnome-icon-theme.noarch : GNOME icon theme
libgnome-keyring.x86_64 : Framework for managing passwords and other secrets
gnome-characters.x86_64 : Character map application for GNOME
gnome-calculator.x86_64 : A desktop calculator
gnome-devel-docs.noarch : GNOME developer documentation
gnome-dictionary.x86_64 : A dictionary application for GNOME
gnome-dvb-daemon.x86_64 : Digital Television manager
gnome-libs-devel.i686 : Libraries and headers for GNOME 1 application development
gnome-libs-devel.x86_64 : Libraries and headers for GNOME 1 application development
gnome-packagekit.x86_64 : Session applications to manage packages
gnome-screenshot.x86_64 : A screenshot utility for GNOME
gnome-system-log.x86_64 : A log file viewer for GNOME
gnome-todo-devel.i686 : Development files needed to write plugins for GNOME To Do
gnome-todo-devel.x86_64 : Development files needed to write plugins for GNOME To Do
gnome-user-share.x86_64 : Gnome user file sharing
gnome-vfs2-devel.i686 : Libraries and include files for developing GNOME VFS applications
gnome-vfs2-devel.x86_64 : Libraries and include files for developing GNOME VFS applications
libgnome-keyring.i686 : Framework for managing passwords and other secrets
gnome-keyring-pam.x86_64 : Pam module for unlocking keyrings
gnome-keyring-pam.i686 : Pam module for unlocking keyrings
gnome-backgrounds.noarch : Desktop backgrounds packaged with the GNOME desktop
gnome-font-viewer.x86_64 : Utility for previewing fonts for GNOME
gnome-menus-devel.i686 : Libraries and include files for the GNOME menu system
gnome-menus-devel.x86_64 : Libraries and include files for the GNOME menu system
gnome-screensaver.x86_64 : GNOME Screensaver
gnome-search-tool.x86_64 : Utility for finding files for GNOME
gnome-disk-utility.x86_64 : Disks
chrome-gnome-shell.x86_64 : Support for managing GNOME Shell Extensions through web browsers
gnome-multi-writer.x86_64 : Write an ISO file to multiple USB devices at once
gnome-python2-rsvg.x86_64 : Python bindings for interacting with librsvg
gnome-themes-extra.x86_64 : GNOME Extra Themes
gnome-video-arcade.x86_64 : GNOME Video Arcade is a MAME front-end for GNOME
java-gnome-javadoc.noarch : Javadoc for java-gnome
gnome-software-snap.x86_64 : Support for Ubuntu Snap packages
gnome-battery-bench.x86_64 : Measure power usage in defined scenarios
gnome-color-manager.x86_64 : Color management tools for GNOME
gnome-desktop-sharp.x86_64 : .NET language binding for mono
gnome-initial-setup.x86_64 : Bootstrapping your OS
gnome-keyring-sharp.x86_64 : Mono implementation of GNOME Keyring
gnome-online-miners.x86_64 : Crawls through your online content
gnome-phone-manager.x86_64 : Gnome Phone Manager
gnome-power-manager.x86_64 : GNOME power management service
gnome-python2-devel.i686 : Development files for building add-on libraries
gnome-python2-devel.x86_64 : Development files for building add-on libraries
gnome-python2-gconf.x86_64 : Python bindings for interacting with GConf
gnome-python2-gnome.x86_64 : Python bindings for libgnome
gnome-python2-totem.x86_64 : Python bindings for interacting with totem
gnome-vfs2-monikers.x86_64 : Monikers for the GNOME virtual file-system
gnome-video-effects.noarch : Collection of GStreamer video effects
gnome-system-monitor.x86_64 : Process and resource monitor
gnome-bluetooth-libs.i686 : GTK+ Bluetooth device selection widgets
gnome-bluetooth-libs.x86_64 : GTK+ Bluetooth device selection widgets
gnome-control-center.x86_64 : Utilities to configure the GNOME desktop
gnome-python2-bonobo.x86_64 : Python bindings for interacting with Bonobo
gnome-python2-canvas.x86_64 : Python bindings for the GNOME Canvas
gnome-python2-extras.x86_64 : Additional PyGNOME Python extension modules
gnome-python2-libegg.x86_64 : Python bindings for recent files and tray icons
gnome-remote-desktop.x86_64 : GNOME Remote Desktop screen share service
gnome-sound-recorder.noarch : Make simple recordings from your desktop
gnome-chemistry-utils.x86_64 : A set of chemical utilities
gnome-software-editor.x86_64 : Banner designer for GNOME Software
bluecurve-gnome-theme.noarch : Bluecurve GNOME theme
gnome-classic-session.noarch : GNOME "classic" mode session
gnome-code-assistance.x86_64 : Common code assistance services for code editors
gnome-desktop-testing.x86_64 : GNOME test runner for installed tests
gnome-nds-thumbnailer.x86_64 : Thumbnailer for Nintendo DS ROM files
gnome-online-accounts.i686 : Single sign-on framework for GNOME
gnome-online-accounts.x86_64 : Single sign-on framework for GNOME
gnome-python2-desktop.x86_64 : The sources for additional PyGNOME Python extension modules
gnome-python2-libwnck.x86_64 : Python bindings for interacting with libwnck
gnome-settings-daemon.i686 : The daemon sharing settings from GNOME to GTK+/KDE applications
gnome-settings-daemon.x86_64 : The daemon sharing settings from GNOME to GTK+/KDE applications
gnome-transliteration.noarch : Off Line transliteration tool
libopenraw-gnome-devel.i686 : Development files for libopenraw-gnome
libopenraw-gnome-devel.x86_64 : Development files for libopenraw-gnome
gnome-activity-journal.noarch : Browse and search your Zeitgeist activities
gnome-epub-thumbnailer.x86_64 : Thumbnailers for EPub and MOBI books
gnome-python2-gtkspell.x86_64 : Python bindings for interacting with gtkspell
gnome-python2-libgtop2.x86_64 : Python bindings for interacting with libgtop
gnome-valgrind-session.noarch : Run an entire GNOME session under valgrind
libgnome-games-support.i686 : Support library for GNOME games
libgnome-games-support.x86_64 : Support library for GNOME games
sflphone-gnome-plugins.x86_64 : Plugins (address book) for SFLphone
gnome-icon-theme-extras.noarch : Additional GNOME icons
gnome-screensaver-frogs.noarch : GNOME Screensaver Slideshow of Frogs
gnome-terminal-nautilus.x86_64 : GNOME Terminal extension for Nautilus
gnome-backgrounds-extras.noarch : Additional GNOME Backgrounds
gnome-packagekit-updater.x86_64 : PackageKit package updater
gnome-password-generator.noarch : Graphical secure password generator
gnome-icon-theme-symbolic.noarch : Symbolic GNOME icons
gnome-kra-ora-thumbnailer.x86_64 : Thumbnailer for Krita and MyPaint images
rss-glx-gnome-screensaver.x86_64 : Really Slick Screensavers
tempest-gnome-screensaver.x86_64 : GNOME screensaver support for tempest
gnome-chemistry-utils-libs.i686 : GNOME Chemistry Utils libraries
gnome-chemistry-utils-libs.x86_64 : GNOME Chemistry Utils libraries
gnome-getting-started-docs.noarch : Help a new user get started in GNOME
gnome-packagekit-installer.x86_64 : PackageKit package installer
gnome-shell-extension-calc.noarch : A simple calculator in the search overview
gnome-shell-extension-freon.noarch : GNOME Shell extension to display system temperature, voltage, and fan speed
gnome-directory-thumbnailer.x86_64 : Thumbnailer for directories
gnome-shell-extension-unite.noarch : GNOME Shell Extension Unite by hardpixel
gnome-shell-extension-common.noarch : Files common to GNOME Shell Extensions
gnome-shell-extension-gpaste.noarch : GNOME Shell extension for GPaste
gnome-shell-extension-pidgin.noarch : Make Pidgin IM conversations appear in the Gnome Shell message tray
gnome-phone-manager-telepathy.x86_64 : Telepathy connection manager to send and receive SMSes
gnome-session-wayland-session.x86_64 : Desktop file for wayland based gnome session
gnome-chemistry-utils-gnumeric.x86_64 : Gnome Chemistry Utils plugin for Gnumeric
clearlooks-compact-gnome-theme.noarch : GNOME Desktop theme optimized for small displays
gnome-shell-extension-pomodoro.i686 : A time management utility for GNOME
gnome-shell-extension-pomodoro.x86_64 : A time management utility for GNOME
gnome-control-center-filesystem.noarch : GNOME Control Center directories
gnome-shell-extension-apps-menu.noarch : Application menu for GNOME Shell
gnome-shell-extension-ibus-font.noarch : A GNOME Shell extension for ibus-setup custom font settings
gnome-shell-extension-panel-osd.noarch : Configure the place where notifications are shown
gnome-shell-extension-drive-menu.noarch : Drive status menu for GNOME Shell
gnome-shell-extension-user-theme.noarch : Support for custom themes in GNOME Shell
gnome-shell-extension-openweather.noarch : Display weather information from many locations in the world
gnome-shell-extension-places-menu.noarch : Places status menu for GNOME Shell
gnome-shell-extension-simple-dock.noarch : Simple Dock for the Gnome Shell desktop
gnome-shell-extension-window-list.noarch : Display a window list at the bottom of the screen in GNOME Shell
gnome-shell-extension-dash-to-dock.noarch : Dock for the Gnome Shell by micxgx.gmail.com
gnome-shell-extension-refresh-wifi.noarch : GNOME Shell Extension Refresh Wifi Connections by kgshank
gnome-shell-extension-topicons-plus.noarch : Move all legacy tray icons to the top panel
gnome-shell-extension-alternate-tab.noarch : Classic Alt+Tab behavior for GNOME Shell
gnome-shell-extension-suspend-button.noarch : GNOME Shell Extension Suspend-Button by laserb
gnome-shell-extension-background-logo.noarch : Background logo extension for GNOME Shell
gnome-shell-extension-disconnect-wifi.noarch : GNOME Shell Extension Disconnect Wifi by kgshank
gnome-shell-extension-windowsNavigator.noarch : Support for keyboard selection of windows and workspaces in GNOME Shell
gnome-shell-extension-auto-move-windows.noarch : Assign specific workspaces to applications in GNOME Shell
gnome-shell-extension-launch-new-instance.noarch : Always launch a new application instance for GNOME Shell
gnome-shell-extension-windowoverlay-icons.noarch : Show app icons on top of the windows thumbnails in Activities Overview
gnome-shell-extension-workspace-indicator.noarch : Workspace indicator for GNOME Shell
gnome-shell-extension-do-not-disturb-button.noarch : Hide desktop notifications until you're ready to look at them
gnome-shell-extension-system-monitor-applet.noarch : A Gnome shell system monitor extension
gnome-shell-extension-no-topleft-hot-corner.noarch : Disable the "hot corner" in the top-left of GNOME Shell
gnome-shell-extension-media-player-indicator.noarch : Control MPRIS2 capable media players: Rhythmbox, Banshee, Clementine and more
gnome-shell-extension-activities-configurator.noarch : Configure the top bar and Activities button in GNOME Shell
gnome-shell-extension-native-window-placement.noarch : Native window placement for GNOME Shell
gnome-shell-extension-screenshot-window-sizer.noarch : Screenshot window sizer for GNOME Shell
gnome-shell-extension-historymanager-prefix-search.noarch : Use PageUp and PageDown to search for previous GNOME Shell commands
==================================================================== 概要 の一致: gnome- =====================================================================
synce-gnomevfs.x86_64 : Gnome-vfs module for synce
libglade.i686 : Gnome-1 support library for loading user interfaces
libglade.x86_64 : Gnome-1 support library for loading user interfaces
gnofract4d.x86_64 : Gnofract 4D is a Gnome-based program to draw fractals
ORBit.i686 : CORBA Object Request Broker for GNOME-1 compatibility
ORBit.x86_64 : CORBA Object Request Broker for GNOME-1 compatibility
libxml.i686 : Old XML library for Gnome-1 application compatibility
libxml.x86_64 : Old XML library for Gnome-1 application compatibility
gphotoframe-gss.noarch : Compatibility package of gphotoframe for gnome-screensaver
目を皿にして見ていくと、ズバリ「gnome-screenshot」なるものがあるので、導入します。
# dnf install gnome-screenshot
依存性が解決されました。
==============================================================================================================================================================
パッケージ アーキテクチャ バージョン リポジトリ サイズ
==============================================================================================================================================================
インストール:
gnome-screenshot x86_64 3.26.0-3.fc28 fedora 202 k
インストール後、PrintScreen（Prt Scr）キーが有効になりました。