Can I change the word ubuntu from my plymouth default theme?

If you are happy with the rest of the theme, you can just replace the logo. In a terminal do the following:

  1. backup the old logo

    sudo cp /lib/plymouth/themes/ubuntu-logo/ubuntu_logo.{png,back}
    
  2. put a copy of the logo on your desktop

    cp /lib/plymouth/themes/ubuntu-logo/ubuntu_logo.png ~/Desktop
    
  3. now edit the logo the way you want

    gimp ~/Desktop/ubuntu_logo.png
    
  4. copy back your logo

    sudo mv ~/Desktop/ubuntu_logo.png /lib/plymouth/themes/ubuntu-logo/
    
  5. update the system to use your logo

    sudo update-initramfs -c -k all
    

To restore the old logo, simply do:

  1. restore old logo

    sudo cp /lib/plymouth/themes/ubuntu-logo/ubuntu_logo.{back,png}
    
  2. update the system to use the old logo

    sudo update-initramfs -c -k all
    

To test the theme without rebooting, you can run the following within a GNOME session to see a multi-window setup running your theme:

sudo plymouthd ; sudo plymouth --show-splash ; sleep 10 ; sudo plymouth --quit

You cannot put whatever you want, but you can choose from different themes. That is because Plymouth themes are basically animated images, to customize them is not as easy as editing a text file or an image with The Gimp. You can try to create your own theme using these guides:

http://brej.org/blog/?p=158 http://brej.org/blog/?p=174

Otherwise you can choice from existing themes:

  • plymouth-theme-kubuntu-logo
  • plymouth-theme-kubuntu-text
  • plymouth-theme-ubuntu-logo
  • plymouth-theme-ubuntu-text
  • mythbuntu-default-settings
  • plymouth-theme-fade-in
  • plymouth-theme-glow
  • plymouth-theme-lubuntu-logo
  • plymouth-theme-sabily
  • plymouth-theme-script
  • plymouth-theme-solar
  • plymouth-theme-spinfinity
  • plymouth-theme-text
  • plymouth-theme-ubuntustudio
  • plymouth-theme-xubuntu-logo
  • xubuntu-plymouth-theme

Just install one of these package, then from the terminal type:

sudo update-alternatives --config default.plymouth

You will be prompted to choose your theme, so choose it :)

Then, last command:

sudo update-initramfs -u