I have Ubuntu 12.04 installed on a Toshiba Satellite C655. No windows and no windows disk. Ubuntu worked great for about a month. About a week ago after updating it started freezing, and on boot I would get an error of "/tmp not ready or not present". Two days ago update manager listed 19 new updates, I let it install and now it will not boot. When I press the power button it goes straight to grub. In grub "Ubuntu, with Linux 3.8.0-31-generic" is highlighted, I press enter and I get "Target file system doesn't have requested /sbin/init. No init found. Try passing init= bootarg." I entered "init= bootarg" and I get, "/bin/sh: bootarg: not found.
Now what do I do?