Ubuntu – How to change file system in recovery mode to read-write mode


I have messed up my sudoers file and I want to change the permission on it.

When I login in recovery mode, I cannot run the command chmod as it is read-only option.

I tried mount -o remount,rw / in recovery mode. Didn't work for me:

Err : Ext4-fs remount. Opts errors=remount-ro 

How can I boot into recovery mode and with read-write option?

Best Answer

I did some web searching on "Recover Mode Read Only" and came across this post on LinuxQuestions.org website.

  1. Shutdown the computer
  2. Boot into Recovery Mode --After BIOS load, hold down Shift key to access the grub menu --Once in grub menu, select the entry ending in "(recovery mode)"
  3. From the next menu selected option to enter Root Session
  4. At the root session, execute command mount -o rw,remount / to remount the filesystem as read-write
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