Comment 1 for bug 538298

Just a brief note outlining how to get the computer booting again, in case someone finds it useful. I assume that the APT cache contains the previous plymouth packages:
- Boot from a live CD/USB stick
- Mount your / partition by selecting it under the "Places" menu
- Open a terminal
- Type:
  sudo bash
  chroot /media/$name_of_your_root_partition
  cd var/cache/apt/archives
  sudo dpkg -i *ply*-12*.deb
- Reboot