I just upgraded Ubuntu from 12.04 to 12.10. I am now stuck as I don't know what to do. The installation have for some reason failed on some place as I am getting error messages on start and shutdown (restart). There were no errors during the installation though. On startup it's saying that dev/sda is an invalid argument and it takes, quite long, time for it to come right and start normal. On shutdown it won't show the old screen but you see the processes made. It also contains an error and it's talking about shutting down and about Apache. I installed through the update manager on Ubuntu 12.04 and I had all updates made before downloading and have several times tried to update the new version but there is nothing to update.
My files are important to me, though at the currently I could unistall all my programs and only loose some time. Does anyone have this problem, please leave a comment and tell me your experience and if you have a ansver how to fix my issues please help.