# ps aux
... <cut> ...
root      9618  0.0  0.0  71288   184 ?        S    09:46   0:00 /usr/bin/perl -w /usr/share/debconf/frontend /var/lib/dpkg/info/nagvis.postinst configure 
root      9626  0.0  0.0      0     0 ?        Z    09:46   0:00 [nagvis.postinst] <defunct>