backport ignoring install types in config mode from install_integration branch

Signed-off-by: Nico Schottelius <nico@bento.schottelius.org>
fix typos in __debconf_set_selections

Signed-off-by: Nico Schottelius <nico@bento.schottelius.org>
++changes(3.0.4)

Signed-off-by: Nico Schottelius <nico@bento.schottelius.org>