For notebook or PC with a touchpad, you’ll find that tap clicking function does not work in the GNOME login screen out-of-the-box, either in Ubuntu or other Linux.
You may hit Enter on keyboard to login after typing password. It will however more convenient if tap to click works when trying to select another user, session, or upper right corner menu. And here’s how to enable this function in Ubuntu 21.10 and Ubuntu 20.04.
Enable Tap Clicking in GDM Login Screen.
Both the System Settings and ‘Dconf Editor’ configuration tool have option to toggle ‘Tap to Click’ in Ubuntu. However, none works for the login screen due to permission issue. You need the
gdm system user privilege to do the setting.
1.) Firstly, open terminal by either searching from the overview screen or pressing Ctrl+Alt+T on keyboard.
2.) When terminal opens, run command to add user
gdm to the control list:
It will indicate that ‘localuser:gdm being added to access control list’.
3.) Finally run
gsettings command to enable ‘tap to click’ using
gdm user privilege:
sudo -u gdm gsettings set org.gnome.desktop.peripherals.touchpad tap-to-click true
If you want to do more settings about the GNOME login screen, you may first install “Dconf Editor” and launch the tool via gdm system user. To do so, paste the command below into terminal and hit run:
xhost SI:localuser:gdm && sudo -u gdm dconf-editor
When it opens, navigate to “org/gnome/login-screen“. There you may toggle settings for disable user list, enable fingerprint, smartcard authentications, and more.
That’s all. Enjoy!