FYI, in case there are some lesser experienced users that have this
issue and are looking for a temporary solution for the time being, below
are the instructions to revert to the previous release of lightdm until
this gets resolved.
You can do this with the following command in a terminal (<CTRL + ALT +
T>):
sudo apt-get install lightdm=1.2.3-0ubuntu2.5
Then to kill the current lightdm session and start a new one using the
previous released version, log out, then press <CTRL + ALT + F1>. Log
into the fullscreen terminal session. Then type the following:
sudo service lightdm stop
sudo service lightdm start
Then to close the terminal session, press <CTRL + ALT + F1> once again,
type exit, then <CTRL + ALT + F7> to return to your lightdm session.
After that, you can log in and you're back to normal.
I also locked the lightdm package after reverting back for the time
being so that I don't accidentally reinstall the broken version by doing
the following in a terminal:
sudo echo "lightdm hold" | dpkg --set-selections
Once this gets fixed or a new version is released later on, you can
release the lock/hold with the following command in a terminal:
sudo echo "lightdm install" | dpkg --set-selections
Hope that helps!
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https://bugs.launchpad.net/bugs/1431654
Title:
lightdm (1.2.3-0ubuntu2.6) 100%/high cpu usage
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