Quote Originally Posted by mastablasta View Post
Lubutnu 12.04 has non PAE image i believe and the OP should be able to boot into live session (alternate installer doesn't have a live session i believe). and 7GB should be enough to install it. but not many additional programmes will fit and also cleaning of old kernel might be needed after updating the OS, because 7GB is a bit low.

furthermore since the 10.04 live session could not be started i suggest usiing some of the available boot options (particulary nomodeset). here is how to do it: https://help.ubuntu.com/community/BootOptions
Thank you for your help. I installed Xubuntu 12.04.2 LTS and everything is working fine.