casey@computadora:~$ sudo ppa-purge ppa:gnome3-team/gnome3-next
[sudo] password for casey:
Updating packages lists
PPA to be removed: gnome3-team gnome3-next
Warning:  Could not find package list for PPA: gnome3-team gnome3-next
casey@computadora:~$ sudo ppa-purge ppa:gnome3-team/gnome3-staging
Updating packages lists
PPA to be removed: gnome3-team gnome3-staging
Warning:  Could not find package list for PPA: gnome3-team gnome3-staging
casey@computadora:~$ sudo ppa-purge ppa:gnome3-team/gnome3
Updating packages lists
PPA to be removed: gnome3-team gnome3
Warning:  Could not find package list for PPA: gnome3-team gnome3
casey@computadora:~$ sudo apt-get remove gnome-shell ubuntu-gnome-desktop
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package 'gnome-shell' is not installed, so not removed
Package 'ubuntu-gnome-desktop' is not installed, so not removed
The following packages were automatically installed and are no longer required:
  gir1.2-accountsservice-1.0 gir1.2-caribou-1.0 gir1.2-gkbd-3.0
  gir1.2-polkit-1.0 gir1.2-telepathylogger-0.2 gir1.2-xkl-1.0 kde-l10n-engb
  libcaribou-common libcaribou0 libdirac-encoder0 libmp3lame0 libnspr4:i386
  libnss3:i386 libopencore-amrnb0 libopencore-amrwb0 libvo-aacenc0
  libvo-amrwbenc0 libxvidcore4 linux-image-3.11.0-18-generic
  linux-image-extra-3.11.0-18-generic linux-signed-image-3.11.0-18-generic
  wine-gecko1.4 wine-gecko1.4:i386
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 13 not upgraded.