EDIT : I can login through
tty but GUI session is failing to start.
Most answers on the net recommend installing gnome again. I don't want to do that if there is a more logical solution.
This is an old question and the reason for it is old as well. I installed GNOME, used it for a few weeks but didn't like the lag, so removed it using these commands:
sudo ppa-purge ppa:gnome3-team/gnome3-next sudo ppa-purge ppa:gnome3-team/gnome3-staging sudo ppa-purge ppa:gnome3-team/gnome3 sudo apt-get remove gnome-shell ubuntu-gnome-desktop
Then tried to install
ubuntu-desktop, which required
ubuntu-session, which required some downgrading.
But the problem persists. How do I use Unity short of reinstalling gnome again? I really have very bad download speeds.