The culprit is that the package "libdconf0" is either not installed or corrupted. So, we'll check if it is installed and then either install or reinstall it. Of course, this could also be done with a single step --by just running the latter most command-- but you may want to know what's going on, right!? And make the process more transparent.
Check if the package "libdconf0" is installed:
dpkg -l |grep libdconf0
If it doesn't show up there, install it:
sudo apt-get install libdconf0
If it does show up there, thus being seemingly corrupted, reinstall it:
sudo apt-get install --reinstall libdconf0
Then relogin to make the changes take effect.
That's all, hopefully!