To whom it may concern: It is unclear to me whether this is the correct channel, so please point me in the right direction if I am mistaken, but after installing mpd yesterday (05/04/2015) on a clean install of Debian Jessie, it seems that I get the same error as was reported in this bug.
Namely, $ sudo apt-get install mpd $ sudo update-rc.d mpd disable leaves mpd in an unusable state, since init keeps holding on to socket 6600. $ sudo systemctl disable mpd.socket fixes it. Bruno Beltran
