I think this might not be a problem of ubuntu-tweak.
check where is the desktop file, find all of them if there are multiple ones, they can be:
/usr/share/applications/ubuntu-tweak.desktop
/usr/local/share/applications/ubuntu-tweak.desktop
~/.local/share/applications/ubuntu-tweak.desktop
......
In terminal:
ls -hl PATH_TO_YOUR_DESKTOP_FILE
paste the output here.
Then:
sudo chmod a+x PATH_TO_YOUR_DESKTOP_FILE
see if the problem still exist.
I think this might not be a problem of ubuntu-tweak.
check where is the desktop file, find all of them if there are multiple ones, they can be: applications/ ubuntu- tweak.desktop share/applicati ons/ubuntu- tweak.desktop share/applicati ons/ubuntu- tweak.desktop
/usr/share/
/usr/local/
~/.local/
......
In terminal: YOUR_DESKTOP_ FILE
ls -hl PATH_TO_
paste the output here.
Then: YOUR_DESKTOP_ FILE
sudo chmod a+x PATH_TO_
see if the problem still exist.
Attach your desktop file here.