Keyboard layout switch issue in Ubuntu 18.04

Solution 1:

Besides running sudo dpkg-reconfigure keyboard-configuration you probably need to remove it from the desktop settings too. Try this command:

gsettings reset org.gnome.desktop.input-sources xkb-options

After that the removal of the extra shortcut should survive a reboot.

Solution 2:

Two moments here:

1. You should not remove keyboard-configuration package. It is used for console (dumb terminal) sessions.

2. To save configuration produced by sudo dpkg-reconfigure keyboard-configuration you need to update initial RAM-drive for kernels with

   sudo update-initramfs -u -k all
   

   and then reboot.