Corruption and Recovery

If during the boot process, one or more filesystems fail to mount, fsck may be used to attempt repair. However, before doing that one should check that /etc/fstab has not been misconfigured or corrupted. Note once again that you could have a problem with a filesystem type the kernel you are running does not understand.

If the root filesystem has been mounted you can examine this file, but / may have been mounted as read-only, so to edit the file and fix it, you can run:

sudo mount -o remount,rw /

to remount it with write permission.

If /etc/fstab, seems to be correct, you can move to fsck. First, you should try:

sudo mount -a

to try and mount all filesystems. If this does not succeed completely, you can try to manually mount the ones with problems. You should first run fsck to just examine; afterwards, you can run it again to have it try and fix any errors found.