After I downloaded the Alternate install CD of Ubuntu 8.0.4, I run this:
gksu "sh /cdrom/cdromupgrade"
The upgrade in process:
Post Mortem:
It deleted my /home dir. So I need to install from scratch.
Or to consider Mandriva.
I have just read a comparison between Ubuntu 8.04 and Mandriva 2008.1 on Whatsup.org.il : :ראש בראש: השוואה בין מנדריבה One 2008.1 ואובונטו 8.04