More info from another bug which has been marked as a duplicate of this one:
Option "XkbOptions" "lv3:ralt_switch" is set by default in xorg.conf.
This can be manually commented out or you can run "sudo dpkg-reconfigure xserver-xorg" and disable the option from in there.
More info from another bug which has been marked as a duplicate of this one:
Option "XkbOptions" "lv3:ralt_switch" is set by default in xorg.conf.
This can be manually commented out or you can run "sudo dpkg-reconfigure xserver-xorg" and disable the option from in there.