Instead of the desktop UI, I get a blank "wallpapter" screen after the normal prompt for password. Cant power down except manually turn off computer power switch. Using Ubuntu 14.04 LTS. Thanks.
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Have you looked at this similar question? Does it work for other users?
Assuming those don't help, the commonest cause of the GUI failing for one user after login, is permissions; I tend to use the rather 'shotgun' approach of going to a terminal (ie ctrl-alt-F1), and typing
sudo -i
cd /home
shopt -s dotglob
chmod -R tom:tom tom
shopt -u dotglob
exit
& try again from user login (ie ctrl-alt-F7). This makes the computer change everything in your home directory to be owned by you, even hidden files.
Mark Williams
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sudo apt-get install --reinstall ubuntu-desktop– Mostafa Ahangarha Apr 14 '16 at 16:00