I'm using Xubuntu 16.10 and it's still impossible to install Gimp from
gnome-software since it's not listed anywhere.
If you look this screenshot, nothing is found when you search 'Gimp'.
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-software in Ubuntu.
Can not install/remove Gimp with Software
Status in gnome-software package in Ubuntu:
Gimp is not shown as installation candidate, even if you navigate to
the "Graphics" category or you type "gimp".
If Gimp is installed with USC or apt, you can't remove Gimp from
Software since it's not listed under "Installed" tab.
DistroRelease: Ubuntu 16.04
Package: gnome-software 3.20.1~git20160331.78d1aab-0ubuntu2
Uname -r: 4.4.0-17-generic
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