I installed Ubuntu 11.10 a few weeks ago and yesterday I upgraded it to 12.04. The upgrade manager installed all packages and then asked me to reboot my computer. Everything went well, I was able to use it without any problem.
Today I turned it on and here is my problem: it won't boot anymore. When it gets to the login screen it freezes.
- I tried opening a terminal with Ctrl+Alt+F1 but it wouln't open.
- I rebooted and tried booting with a older kernel version but it didn't work.
- Then I booted from the recovery and tried to fix it but I couldn't.
When I was at the recovery menu I tried to activate the network option, but the network-manager failed and the system freezed. I think that may be the problem, but I don't know how to fix it. Thank you for your help.