I've just encountered the same bug when trying to install lxdm:
bash -x /var/lib/dpkg/info/lxdm.postinst
+ set -e + . /usr/share/debconf/confmodule ++ '[' '!' '' ']' ++ PERL_DL_NONLAZY=1 ++ export PERL_DL_NONLAZY ++ '[' '' ']' ++ exec /usr/share/debconf/frontend /var/lib/dpkg/info/lxdm.postinst Use of uninitialized value $action in string eq at /usr/share/debconf/frontend line 27.
I've just encountered the same bug when trying to install lxdm:
bash -x /var/lib/ dpkg/info/ lxdm.postinst
+ set -e debconf/ confmodule debconf/ frontend /var/lib/ dpkg/info/ lxdm.postinst debconf/ frontend line 27.
+ . /usr/share/
++ '[' '!' '' ']'
++ PERL_DL_NONLAZY=1
++ export PERL_DL_NONLAZY
++ '[' '' ']'
++ exec /usr/share/
Use of uninitialized value $action in string eq at /usr/share/