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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.

2

I have fixed the problem. There were 2 issues.

1. First Issue was with display-manager. Found the solution by searching in this forum. This was fixed by reinstalling unbuntu-desktop and unity.

dpkg-reconfigure -a
dpkg --configure -a --force-all
apt-get install ppa-purge
apt-get install --reinstall ubuntu-desktop
apt-get install --reinstall unity
reboot

After this I was getting login screen but it won't login, because of Display driver issues.

2. Second issue was with libegl1-mesa-lts-utopic - which is a left-over during upgrade for Utopic to Vivid.

This was identified from Boot in Recovery mode> Clean Packages
Following are the steps I have done to fix:

apt-get autoremove libegl1-mesa-lts-utopic
apt-get update
apt-get upgrade
reboot
apt-get autoremove
dpkg --configure -a
apt-get clean
apt-get autoclean
apt-get autoremove

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