I am not sure how many files that this happens to, but it has happened to two that I have tried in the last few days, one .sh file and another program/executable. I am logged in as root - Linux Mint 21.2 When I try to allow executing as a program it unticks itself (as in this video) I also get ‘permission denied’ in terminal, as root and i have tried
chmod +x filename
and
sudo chmod -v +x filename.sh
sudo chown --verbose 1000 filename.sh
But still get denied… What am I doing wrong here or how can I fix this?


Can’t explain why your file browser doesn’t work and I don’t suggest logging into your desktop as root. You should take steps to make that impossible, in fact.
Now you said this doesn’t work
sudo chmod -v +x filename.shAnd that’s baffling. What is the exact error message and output of that command? Also is the file in question in a weird place or on a weird filesystem?