Could not update .ICEauthority file
This error message was related to gdm3.
I removed gdm3 and installed it again to get rid of the error message.
The commands I issued were:
aptitude remove gdm3
aptitude remove gnome-session
shutdown -r now
aptitude install gdm3
aptitude install gnome-session
aptitude install gnome-core
shutdown -h now
I started the computer after 30 seconds. The error was gone.