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:
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