Skip the sad story I am a great fan of ubuntu and I have been installing and uninstalling 10.04 LTS to 10.10 to 11.04 to 11.10 and go back again to 10.04 LTS or shift to Linux Mint and caused me a lot of time and a lot of data loss.  One of the biggest problem that I had since upgrading to higher versions of ubuntu or Mint was the display.  After the upgrade I needed to add i915.nomodeset=0

I am a loyal user of Thunderbird and ubuntu 10.04 is by default using evolution for its mail client. So what I did was uninstalled all the packages related to evolution using synaptic manager. I did a complete removal of the packages and restarted my laptop. After uninstalling I was no longer able to login with my account even if I correctly entered my credentials. I used ubuntu recovery option on grub menu and went to the console, I checked