If I try to change the plymouth theme I get this error and plymouth is displayed only in text mode:
sudo update-alternatives --config default.plymouth
update-alternatives: warning: forcing reinstallation of alternative
/lib/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth because link group default.plymouth is broken.
update-alternatives: warning: not replacing /lib/plymouth/themes/default.plymouth with a link.
How to fix this? I am using ubuntu 11.04