On my system (Ubuntu 18.04 LTS onto which the ubuntu-unity-desktop meta-package has been installed from the Universe repo), the Unity8 installer attempts to upgrade indicator-keyboard/bionic to a newer version found in the UBports repo. However, at least on my system, indicator-keyboard/bionic from the UBports repo has unresolvable dependencies, and so the Unity8 installer fails to upgrade this one package.
Info from terminal:
$ sudo apt list --upgradable
Listing... Done
indicator-keyboard/bionic 0.0.1+ubports1+0~20180219162249.1~1.gbp660b9a amd64 [upgradable from: 0.0.0+18.04.20180216-0ubuntu1]
N: There is 1 additional version. Please use the '-a' switch to see it
Info from Synaptic:
The following packages have unresolvable dependencies. Make sure that all required respositories are added and enabled in the preferences.
indicator-keyboard:
Depends: libgnome-desktop-3-12 (>=3.17.92) but it is not installable
Because this issue seems more related to Unity8, and not related to the Unity8 installer, I'm closing this issue and moving it to the Unity8 issue tracker here.
On my system (Ubuntu 18.04 LTS onto which the ubuntu-unity-desktop meta-package has been installed from the Universe repo), the Unity8 installer attempts to upgrade indicator-keyboard/bionic to a newer version found in the UBports repo. However, at least on my system, indicator-keyboard/bionic from the UBports repo has unresolvable dependencies, and so the Unity8 installer fails to upgrade this one package.
Info from terminal:
Info from Synaptic: