recovery mode. log in with read + write access

source: http://askubuntu.com/questions/240527/is-recovery-mode-supposed-to-hang-after-fsck

in the recovery menu just select Drop to root shell prompt and inside try

sudo fdisk -l

to get a list of drives and partitions

mount

should give something like

/dev/sdb5 on / type ext4 (rw,errors=remount-ro)

and then with the partition you just found

sudo fsck -f/dev/sdb5
sudo mount /dev/sdb5 / -o remount,rw

fsck -f forces a check, even if there is no indication of a problem on the partition.
Now your root partition is error free and mounted (rw). You would now be able to do anything there with root permissions - so be careful!