[Solved] Unable to boot due to GNOME Power Manager error

If you are getting the following error while booting into ubuntu, its most likely due to low disk space in root drive:

“The configuration defaults for GNOME Power Manager have not been installed correctly. Please contact your computer administrator.”

Behavior:
After you enter the password on login screen, it takes you back to login screen making you unable to log in.

Solution:
However, you can still get to terminal. Press Ctrl+Alt+F1 to drop to terminal from login screen. Enter your username and password and execute the following command:

sudo apt-get clean

This will clean up the package cache freeing up lots of disk space. If you don’t have anything in the cache you’ll have to move your files to another partition. You can use mv for the purpose.

mv source destination

For eg;

mv ./file.zip /media/disk-3/file.zip

This will move the file – file.zip to /media/disk-3.

For people who still have the same error can try some alternate fixes as mentioned below:

• Chmodding /tmp to 0777 have worked for many people.

  chmod 0777 /tmp

• Try to reconfigure your packages.Source

  sudo dpkg --configure -a

• Manually create the directory /var/lib/gconf/default/. Source

  mkdir /var/lib/gconf/default

• Reinstall GNOME and dependencies

  sudo apt-get --reinstall install ubuntu-desktop
  

  Note that this command will remove some settings. Source

Cheers!