The problem comes when stopping the system.Try Ctrl-D. Editing /etc/inittab to boot single user is another option.
The only way to do it is by pressing CTRL+ALT+DEL as CTRL+C does not
work in that mode.
Unfortunately, by using CTRL+ALT+DEL combination, Linux kernel does
the unclean unmounting of root filesystem.
This causes the file-system check on next boot time. :-(
Thanks