SHELL

chmod: changing permissions of : Read-only file system and writeable

sudo mount -o remount,rw '/media/username/drivename'
sudo chmod ugo+wx /media/username/drive name

change file read only permissions linux

“sudo chmod a+rwx /path/to/file” into the terminal, 
replacing “/path/to/file” with the file you want to give 
permissions to everyone for, and press “Enter.”