I'm trying to set permissions for folders on USB drives that I've mounted with Nautilus, but when I change the permission, it just changes right back again. No error message or any other explanation. I've tried "Open as administrator" and it still doesn't work. How do I set the permissions so that they can be accessed as shared folders on the network?
The problem is that your USB stick is probably using FAT(16/32) or NTFS as file system which doesn't support permissions. That's why they change back after edit in nautilus. If you want to use permissions with USB sticks/drives, you'll need to format it to any EXT formats (use either 3 or 4) using gparted (install with synaptic).
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