Comment 4 for bug 451556

I think this is something new, I get now:
...
Errors were encountered while processing:
 rsyslog
 ubuntu-minimal
Setting up rsyslog (4.2.0-2ubuntu5) ...
start: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused
invoke-rc.d: initscript rsyslog, action "start" failed.
dpkg: error processing rsyslog (--configure):
 subprocess installed post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of ubuntu-minimal:
 ubuntu-minimal depends on rsyslog; however:
  Package rsyslog is not configured yet.
dpkg: error processing ubuntu-minimal (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 rsyslog
 ubuntu-minimal

in my auto-upgrade testing setup (for a server install). That used to work, so its probably something that changed recently.