There is a disk partition mounted to two directories. I directly executed `umount -a` to unmount both mounts, but the configuration in `/etc/fstab` was not cleared.
After opening /etc/fstab with vi, I restored it to its original state, but an error message appeared when saving.
-- INSERT -- w10: Warning: Changing a readonly file
When saving after making changes, a prompt appears.
'fstab' E212: Can't open file for writing
:w! didn't work either.
It seems it was mounted as read-only. So, execution...
root# mount -o remount,rw /
Try using `vim /etc/fstab` again, and you should be able to save it.
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Original author:Jake Tao,source:Solution to the error "/etc/fstab cannot open file for writing, unable to modify or save".
