I have recently upgraded from Mint 18.3 to 19.1 Cinnamon, by a two-stage process. I had to install 19.0 first.
Since upgrading, I cannot edit panels. The following commands on the panel context menu do not work (i.e. a click achieves nothing, no action, no error message, nothing at all):
• Add applets to the panel • Panel settings • Themes • System settings
It is the same regardless of the Panel edit mode.
I have similar problems with the desktop context menu. I cannot change the background or add Desklets, but I can create a launcher. Also, the screensaver does not work.
The problems have persisted over reboots and Cinnamon restarts.
During the upgrade, I deleted lots of packages, due to having accumulated much rubbish, as I tried different desktop environments and other packages. I thought it was safe as I was upgrading anyway.
Of course, I can do a fresh install, but I would prefer to avoid that, as I have other stuff that is working well.
Am I missing any Cinnamon components? Is there a ‘repair’ option available?