Disk Drive / not ready yet or not available

I'll tell you the whole story.

I decided to upgrade my natty from alpha to beta after a long time.After the updates has been downloaded, the system crashed during installation. I rebooted the system and during the plymouth screen I greeted with the error message

"Disk Drive / not ready yet or not available"

and options to wait,skip or manually recover

If I choose to skip, it gives the same error,but with /tmp this time.

And if I skip again, it just freezes.

If I choose the option to manually recover, I get a maintenance shell.

Please help.

Solution 1:

This code works fine on my machine (try it just once and the problem should be fixed):

mount -o remount, rw /

My Ubuntu is: Ubuntu 12.04: 3.2.0-49-generic #75-Ubuntu x86_64 GNU/Linux