18.04 recently lost tap-to-click at login (gdm)

Solution 1:

Try this: Enable ‘Tap to click’ in Ubuntu. It worked for me.

1. Open terminal via Ctrl+Alt+T, then run command to get root privileges:

   sudo -i
   

   Type in your password (no visual feedback while typing) when it prompts and press Enter.

2. (Not required in default Wayland session) Allow user gdm to create a connection to the X server:

   xhost +SI:localuser:gdm
   

3. Switch to user gdm in the terminal:

   su gdm -s /bin/bash
   

4. Finally enable 'Tap to click' via gdm user:

   gsettings set org.gnome.desktop.peripherals.touchpad tap-to-click true
   

   

5. Restart your computer and done.

   sudo reboot
   

How to Restore:

To restore the setting, open terminal and redo the previous steps except run the following command instead of the command in Step 4:

    gsettings set org.gnome.desktop.peripherals.touchpad tap-to-click false