fstab
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Solution to "/etc/fstab cannot open file for writing" error - unable to modify or save.
There's a disk partition mounted to two directories. I directly executed `umount -a` to unmount both mounts. The configuration in `/etc/fstab` wasn't cleared. After opening `/etc/fstab` with `vi`, it reverted to its original state, but saving resulted in the error message "-- INSERT…".
