I exec your two commands:
sudo pacman -Rdd light-locker-consolekit
sudo pacman -S networkmanager
and i can update the system but now i can't shutdown the system in graphic mode, only i can "close session".
I close session and after this, when i try to click in the shutdown symbol in the upper right corner, it appear greyed (disable).
I try shutdown from terminal with "sudo shutdown now" but don't shutdown correctly, it stops in the "Setting hardware clock ...", require a hard shutdown.
See the screen captures: