I am using Ubuntu 14.04.1 which is a fresh install of about one month old.
I was trying to get 5.1 surround audio to work so I followed the instructions here which suggested the following commands:
sudo apt-get remove –purge alsa-base pulseaudio sudo apt-get install alsa-base pulseaudio sudo alsa force-reload
At the time I wasn't paying much attention and there was a message saying the following packages would be removed:
alsa-base* indicator-sound* libcanberra-pulse* pulseaudio* pulseaudio-module-bluetooth* pulseaudio-module-x11* ubuntu-desktop* unity-control-center* unity-control-center-signon* webaccounts-extension-common* xul-ext-webaccounts*
...which I went ahead with because I had no reason to think anything would go wrong. Afterwards, however, I noticed that the Systems Settings dialog looked different (kind of gnome-y) and had only a few icons listed.
I tried to reverse the process by using
apt-get install copying and pasting after all the above packages that I was told would be removed. However, this resulted in seemingly quite a large number of additional packages being installed which process took about 5-10 minutes to complete.
Now, when I restart my system, the shut down screen says "Shutting down Lubuntu", the grub screen is black instead of the old orange-brown, the system log in screen is totally different, and the dash bar has changed colour and appearance to brown with a different style Ubuntu logo than the one I had before (I think it is the Edubuntu logo). Besides that, everything else still seems to work.
Somewhere among all the packages that were installed it seems Lubuntu and/or Edubuntu and related packages have been installed.
I don't want Lubuntu, Edubuntu or any unnecessary additional packages associated with the above installation process. How can I remove Lubuntu / Edubuntu and revert to the Ubuntu system I had before?
An explanation of how these other packages got installed from the above commands would also be a bonus.