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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

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This error message indicates that you have somehow replaced the /lib/plymouth/themes/default.plymouth symlink, which is managed by the plymouth theme packages, with a real file. Since you want to select a different theme, you can accomplish this by running:

sudo rm -f /lib/plymouth/themes/default.plymouth
sudo update-alternatives --config default.plymouth

If the contents of /lib/plymouth/themes/default.plymouth are something you care about preserving, you can move the file aside instead of removing it.

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try to gksu nautilus and go to lib/plymouth/themes and open your default.plymouth file and make sure it has all the right filenames

[Plymouth Theme]
Name=INT2MIL-Ubuntu-10.10-Eng theme #this should right the name of the folder of your theme
Description=Ubuntu plymounth theme


make sure it is correct and also check the directory for your current theme and see if any files are missing.

Ohh and instead of doing a sudo update-alternatives --config default.plymouth you can edit the default.plymouth file and change the theme name, image directory and script directory to your new theme and the just sudo update-initramfs -u

And on your next boot you will see the new Plymouth splash if all went well. Good luck

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