I've got this problem too, Xapian doesn't seem to be the cause.
Workaround that works for me is: 'start /usr/bin/kcmshell5 kcm_driver_manager' then run 'ubuntu-drivers list'
The driver list will appear in the kcm_driver_manager.
problem is, for me neither nouveau nor nvidia drivers work. but that's a different bug.
I've got this problem too, Xapian doesn't seem to be the cause.
Workaround that works for me is: 'start /usr/bin/kcmshell5 kcm_driver_manager' then run 'ubuntu-drivers list'
The driver list will appear in the kcm_driver_manager.
problem is, for me neither nouveau nor nvidia drivers work. but that's a different bug.
Fresh install of Kubuntu 16.4.1