Upgrading my old iBook to Xubuntu 11.04 after not having used it for many months was no problem!
Out of curiosity I installed Unity only to be told that my hardware to was too lame to run it. Installing it had the unfortunate side-effect of getting the Nautilus file manager again. Thus, whenever I started a session, the blue Xfce session manager (gdm?) background would be replaced by the rust brown background used by Nautilus for a second, until it was again replaced by the blue background of the Xfce file manager Thunar. I went back to my old post, 2010-07-24 Ubuntu to Xubuntu. I ended up removing
nautilus and some dependencies, verified that
sudo apt-get remove ubuntu-desktop had nothing to remove and ran
sudo apt-get autoremove. Let’s restart and check.