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

filesystemmount

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.

Shutdown the computer
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)"
From the next menu selected option to enter Root Session
At the root session, execute command mount -o rw,remount / to remount the filesystem as read-write

Related Solutions

Ubuntu – How to make read-only file system writable

If a filesystem has been mounted read-only, chmod will not work since it's a write operation too.

Try remounting it read-write:

sudo mount -o remount,rw '/media/SGTL MSCN'

If the device has a write lock on it (like SD memory cards), you need to turn it off. Hardware locks cannot be disabled by software. Note that the write lock on SD memory cards is located from the sight you see the letters near the up left corner and it looks like a very small switch.

Some filesystem drivers may also not support write operations, this is the case with the older NTFS module supported by Linux. For NTFS filesystems, be sure to use the ntfs-3g driver which should be picked automatically nowadays. If not, you can force the driver with something like:

sudo mount -t ntfs-3g -o uid=$(id -u) /dev/sdb1 /mnt/

(where /dev/sdb1 has to be substituted for your block device and /mnt/ for your destination)

Best Answer

Related Solutions

Ubuntu – How to make read-only file system writable

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