My computer shutdown because of critical temperature reached. I was upgrading my Ubuntu 11.04 to 11.10. Now, Ubuntu is not starting up.
Now you are 'inside' your normal partition and all commands you run are from that partition, same goes for the modifications! So you can fix your installation now.
Normally you can continue/fix a failed apt-get using:
You might want to rerun:
Depending on your problem (eg apt-get itself is broken due to the interrupted upgrade) you might to run some other commands in your chroot-ed environment as well. If you do not succeed you need to provide more details.