Recently, I noticed that update manager was installing gnome-shell.
To be sure that is the case, I tried logging in with the Gnome option and I got to the Gnome 3 window manager.
Trying to remove it through
sudo apt-get autoremove gnome-shell doesn't warn of the automatic removal of other packages, suggesting it is not a dependency issue.
I do not intend to use gnome-shell. Why was it installed automatically in the first place?