Bug#324779: apache2-mpm-worker should check whether apache2 is installed
I installed apache2, which caused apache2-mpm-worker to be installed.
I then removed apache2, which did not cause apache2-mpm-worker to be
removed. When I tried to upgrade it or remove it, it tried to invoke
(from line 8 of it's prerm script):
/usr/sbin/invoke-rc.d apache2 stop
But since apache2 was not there, the stop failed, and it could not be
removed. I had to manually edit the prerm script to remove it. This
might also be an issue with other apache2 friends.
Thanks so much for the hard work!