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While updating ubuntu my system crashed and after restarting and entering to ubuntu I get the message Root filesystem check failed.Very much similar to the post Ubuntu 13.04 to 13.10: Filesystem check or mount failed. I tried to fix it with the instruction mentioned there as 

mount -o remount,rw /
dpkg --configure -a
mount -o remount,ro /
sync
reboot

But the problem is after executing mount -o remount,rw / I get:

mount: cannot remount block device /host/ubuntu/disks/root.disk read-write.
is write-protected.

After executing dpkg --configure -a I get:

dpkg: error: unable to access dpkg status area: Read-only file system.

After executing the remaining commands, nothing happens apart from a reboot at the end.
Can somebody please suggest a fix.

Community
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Rahul Patel
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2 Answers2

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Boot from a live CD or USB and supposing that your HDD will be /dev/sda, issue this command

sudo fsck.ext4 -p -f /dev/sda1

assuming that your root partition is the first one, and you have ext4 on it.

Frantique
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  • It gives error fsck.ext2: Permission denied while trying to open /dev/sda1. You must have r/w access to the filesystem or be root – Rahul Patel Jan 08 '15 at 14:11
  • See updated answer. – Frantique Jan 08 '15 at 14:13
  • It says: fsck.ext4: Bad magic number in super-block while trying to open /dev/sda1 /dev/sda1: The superblock could not be read or does not describe a valid ext2/ext2/ext4 filesystem. If the device is valid and it really contains an ext2/ext3/ext4 filesystem (and not swap or ufs or something else), then the super block is corrupt, and you might try running e2fsck with an alternate super block: e2fsck -b 8193 <device> or e2fsck -b 32768 <device> – Rahul Patel Jan 08 '15 at 14:26
  • Ask a professional to help you, or do what the message says. (sudo e2fsck -b 8193 /dev/sda1) This is a major issue (could be even faulty HDD). – Frantique Jan 08 '15 at 14:56
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Seems that u forgot to add sudo before your commands.You need to be root user if you want to remount( idk if you just ignored the sudos HERE for typing faster)

leighton
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