The recent upgrade did not deal with obsolete conffiles properly. Please use the dpkg-maintscript-helper support provided by dh_installdeb to remove these obsolete conffiles on upgrade. https://www.debian.org/doc/debian-policy/ch-files.html#s-config-files https://manpages.debian.org/man/1/dh_installdeb This bug report brought to you by adequate: https://bonedaddy.net/pabs3/log/2013/02/23/inadequate-software/ $ p=memlockd ; adequate $p ; dpkg-query -W -f='${Conffiles}\n' $p | grep obsolete memlockd: obsolete-conffile /etc/memlockd.cfg memlockd: obsolete-conffile /etc/default/memlockd /etc/memlockd.cfg 829b25475bb483525cb00bbf5d4f68f3 obsolete /etc/default/memlockd 65446dbae5065d303d0bbf538882a6f8 obsolete