Comment 22 for bug 1707352

@dino99: You cannot sqitch the zesty version any more. At least if you want your computer have a working graphical user interface: lib colord depends in libsane1 - and colord on libcolord. And gnome on colord:

gunter@Marius:~$ sudo apt-get remove libcolord2
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
  emacs25-lucid xaw3dg
Suggested packages:
  emacs25-common-non-dfsg
The following packages will be REMOVED:
  apport-gtk apturl bamfdaemon baobab brasero brasero-cdrkit cairo-dock
  cairo-dock-core cairo-dock-plug-ins
  cairo-dock-plug-ins-dbus-interface-python cairo-dock-plug-ins-integration
  caribou cheese chrome-gnome-shell classicmenu-indicator colord compiz
  compiz-gnome dconf-editor easytag emacs24 emacs25 evince
  evolution-data-server evolution-data-server-online-accounts file-roller
  firefox frei0r-plugins gcr gedit gir1.2-appindicator3-0.1 gir1.2-caribou-1.0
  gir1.2-clutter-1.0 gir1.2-gcr-3 gir1.2-gdl-3 gir1.2-gnomebluetooth-1.0
  gir1.2-gnomedesktop-3.0 gir1.2-gspell-1 gir1.2-gtk-3.0 gir1.2-gtksource-3.0
  gir1.2-gtkspell3-3.0 gir1.2-gweather-3.0 gir1.2-mutter-1 gir1.2-nautilus-3.0
  gir1.2-nmgtk-1.0 gir1.2-peas-1.0 gir1.2-rb-3.0 gir1.2-totem-1.0
  gir1.2-vte-2.91 gir1.2-webkit2-4.0 gir1.2-wnck-3.0 gjs gkbd-capplet
  gnome-bluetooth gnome-control-center gnome-disk-utility gnome-font-viewer
  gnome-getting-started-docs gnome-getting-started-docs-de gnome-keyring
  gnome-online-accounts gnome-power-manager gnome-screensaver gnome-screenshot
  gnome-session gnome-session-bin gnome-session-wayland gnome-settings-daemon
  gnome-shell gnome-software gnome-software-plugin-snap gnome-system-log
  gnome-system-monitor gnome-system-tools gnome-terminal gnome-tweak-tool
  gnome-user-docs gnome-user-guide gnome-user-share gstreamer1.0-clutter-3.0
  gstreamer1.0-plugins-bad gtk3-engines-unico gucharmap gufw handbrake ibus
  ibus-gtk3 indicator-application indicator-printers language-selector-gnome
  libappindicator3-1 libavahi-ui-gtk3-0 libbrasero-media3-1 libcanberra-gtk3-0
  libcanberra-gtk3-module libcaribou0 libcheese-gtk25 libcheese8
  libclutter-1.0-0 libclutter-gst-3.0-0 libclutter-gtk-1.0-0 libcolord-gtk1
  libcolord2 libcolorhug2 libevdocument3-4 libevview3-3 libgail-3-0
  libgcr-ui-3-1 libgdl-3-5 libgdl-3-dev libgjs0g libgldi3 libgnome-bluetooth13
  libgnome-desktop-3-12 libgnomekbd8 libgoa-backend-1.0-1 libgspell-1-1
  libgspell-1-dev libgtk-3-0 libgtk-3-bin libgtk-3-dev libgtkmm-3.0-1v5
  libgtkmm-3.0-dev libgtksourceview-3.0-1 libgtksourceview-3.0-dev
  libgtkspell3-3-0 libgtkspell3-3-dev libgtkspellmm-3.0-0v5
  libgtkspellmm-3.0-dev libgucharmap-2-90-7 libgweather-3-6 libido3-0.1-0
  libindicator3-7 libmetacity1 libmutter-1-0 libnautilus-extension1a
  libnm-gtk0 libnma0 libopencv-calib3d3.1 libopencv-contrib3.1
  libopencv-features2d3.1 libopencv-highgui3.1 libopencv-objdetect3.1
  libopencv-stitching3.1 libopencv-videostab3.1 libpeas-1.0-0
  libreoffice-avmedia-backend-gstreamer libreoffice-gnome libreoffice-gtk3
  librhythmbox-core10 librsvg2-bin libtimezonemap1 libtotem0 libunique-3.0-0
  libunity-settings-daemon1 libvte-2.91-0 libwebkit2gtk-4.0-37
  libwebkit2gtk-4.0-37-gtk2 libwebkit2gtk-4.0-dev libwebkitgtk-3.0-0
  libwnck-3-0 libyelp0 lightdm-gtk-greeter meld metacity mousetweaks mutter
  nautilus nautilus-extension-brasero network-manager-gnome
  network-manager-openvpn-gnome notify-osd pinentry-gnome3 policykit-1-gnome
  python-nautilus python3-aptdaemon.gtk3widgets qt5-gtk-platformtheme
  redshift-gtk seahorse seahorse-daemon shotwell software-properties-gtk
  soundconverter ssh-askpass-gnome system-config-printer
  system-config-printer-common thunderbird thunderbird-locale-de
  thunderbird-locale-en thunderbird-locale-en-gb thunderbird-locale-en-us
  totem totem-plugins transmission-gtk ubuntu-docs ubuntu-release-upgrader-gtk
  ubuntu-software update-manager update-notifier usb-creator-gtk vino weston
  xdg-user-dirs-gtk xiphos yelp zenity
The following NEW packages will be installed:
  emacs25-lucid xaw3dg
0 upgraded, 2 newly installed, 206 to remove and 0 not upgraded.
Need to get 3.650 kB of archives.
After this operation, 673 MB disk space will be freed.
Do you want to continue? [Y/n]

This basically means that you currently need two Ubuntu installations: One you can scan with - and one to do the rest of the work.