While apt-get upgrade-ing a server that apparently had bind9 installed, it barfed out complaining about something about sendmail. Weird, as sendmail isn’t installed (at least not any longer), but since sendmail isn’t installed, it couldn’t be removed either.
The solution: mv /etc/resolvconf/update-libc.d/sendmail /tmp — and run dpkg / apt-get / aptitude again. If it works now (and you don’t have sendmail installed either), delete the file from /tmp.
/etc/resolvconf/update-libc.d/sendmail: 7: .: Can't open /usr/share/sendmail/dynamic run-parts: /etc/resolvconf/update-libc.d/sendmail exited with return code 2 run-parts: /etc/resolvconf/update.d/libc exited with return code 1 invoke-rc.d: initscript bind9, action "restart" failed. dpkg: error processing bind9 (--configure): subprocess installed post-installation script returned error exit status 1 Errors were encountered while processing: bind9
Thank you ! :)
Finally rid of that annoying error that I have been neglecting to fix for ages.. Since 2014 according to my serial in BIND config anyway :P