It happened twice:
1) first when the computer had LL 3.4 and installed the latest updates.
2) Second, it started to happen after installing the latest updates for a new installation of LL 3.8 (on the same computer)
- I installed LL 3.8 from scratch (all fine)
But, after I installed the latest updates... most of the applications stopped launching anymore.(even LL 'Install Updates')
So, I searched the web and found the following solution: run from terminal
sudo apt remove virtualbox-guest*
source:
https://forums.linuxmint.com/viewtopic.php?t=266710Hope it helps