I recently installed the KDE Kubuntu desktop but after somehow working with i decided to use pure GNOME Ubuntu desktop again.I remove Kubuntu desktop and its packages completely but Kubuntu background image still running at time of booting the system and shutting down it. I tried the steps below at terminal , it made the shutting down background image correct but still the background image of booting time is kubuntu image. sudo update-alternatives --set default.plymouth /lib/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth How could i change this image to the default Ubuntu image too?