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Re: Locked files on USB sticks in Linux Mint 19.3

If you are happy with that idea in principle then yes; please do mark you first post title as [SOLVED]. 

Using "open as root" is always a good idea to try - there's nothing to lose.  We did do that earlier without success which is why we sought other solutions.  Have a go now just out of interest. 
You've been very patient and I am pleased that the problem is more or less resolved. 

May I make a suggestion about your file names?  Creating file names that contain spaces and any special characters (, ' ...
If you are happy with that idea in principle then yes; please do mark you first post title as [SOLVED]. 

Using "open as root" is always a good idea to try - there's nothing to lose.  We did do that earlier without success which is why we sought other solutions.  Have a go now just out of interest. 
You've been very patient and I am pleased that the problem is more or less resolved. 

May I make a suggestion about your file names?  Creating file names that contain spaces and any special characters (, ' ...