Upp, sorry, I forgot "-y" Code: apt-get install --reinstall -y system-ui-screenlock-nokia And I hope you do this as ROOT... AMD, learn to read... No problem with Tweak T-3.. I don't know what you did, what you installed what you changed in your system etc... Try to uninstall all from Tweak T, do it from tweak.
apt-get install --reinstall -y system-ui-screenlock-nokia
I will vote AMD for president next time if I'm having any shares during next meeting.