Reboot, from GRUB Menu -> advance option - recovery Get to the maintenance root shell, and:


type fdisk -l to get a list of the drives in the system, or from the output of df -h ,then do a fsck on the / (using it's disk-name from the list, for example /dev/sd2 partition To force a disk check.

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