After upgrading to Kubuntu 15.04, I am having a lot of problems. On reboot, it was stuck at Kubuntu logo (it keeps on glowing) but nothing happens.
On switching to Recovery mode, I was getting "Error getting authority: Error initializing authority: Could not connect: No such file or directory (g-io-error-quark, 1)".
From recovery mode, I have removed Kubuntu, KDE and switched back to Ubuntu by using following commands:
sudo apt-get autoremove kubuntu-desktop
sudo apt-get autoremove kde
sudo apt-get clean
sudo apt-get autoclean
sudo apt-get install --reinstall ubuntu-desktop
On reboot, I am getting a black screen with a mouse cursor (after nearly 5 mins). It won't proceed further.
Please help me resolve this without re-installing.