Upgrade Ubuntu 10.10 to 11.10

I have done an upgrade from Ubuntu 10.10 (Maverick Meerkat) to 11.10 (Oneiric Ocelot) using the "Update Manager".

First I had to upgrade to 11.04 (Natty Narwhal). This worked fine and after reboot I launched directly the second upgrade to 11.10.

Here I report the problems and solutions I discovered after the upgrade:

1. Booting did not work: "Failed to load the Nvidia kernel module"
   The reason for this was that the GRUB bootloader was loading the wrong kernel 2.6.35 instead of 3.0.0. Therefore I had to change manually the entry in the grub.conf file:
   kernel /vmlinuz-3.0.0-14 ro root=UUID=932dad41-f43a-4a60-9257-198f026da80e
   
   To find the UUID use:
   df -hsudo blkid
2.  Replace the very annoying "Ubuntu One" standard desktop:
   Install gnome shell: sudo apt-get install gnome-shell
   Logout and login to the Gnome (no effects) desktop.
3. phpmyadmin did not work right away. This problem was discussed previously on this blogg.