init error, laptop wont boot?

hi

I turned my computer on and it comes up with ways to boot and I clicked Ubuntu with linux 2.6.38-13-generic. There was a recovery mode too. Once I clicked its writing come up:

init: udevtrigger main process (93) terminated with status 1
init: udevtrigger post stop process (97) terminated with status 1
init: udevtrigger main process (92) killed by TERM signal
mountall: disconnected from plymouth
init: plymouth-splash main processs (98 ) terminated with status 2
init: plymouth main process (50) killed by SEGV signal

I have no idea what this means and my laptop don't boot. I tried recovery mode but it comes up with similar things. I don't know why this has happened. It can be because I tried upgrading my Ubuntu to 11.0 and I shutdown the laptop before it finished? i would be most grateful if you could help
amna