I have installed Ubuntu 18.04 with Unity using the mini ISO. So I don't have GNOME installed with Unity. My problem is that keyboard shortcuts (e.g., launching Terminal or switching between keyboard layouts) don't work. Searching online, some have suggested to add
sleep 2 before launching
/usr/lib/systemd/user/unity7.service. This worked once but after I rebooted it didn't work anymore. Others have suggested to toggle
CompizConfig Settings Manager. This works but I have to redo it every time I log out. Is there any permanent solution to this? This is really irritating.
Update: Apparently, this is a bug according to this link.