This looks like an issue with gconf2, but is probably fixed at this point. It happened for a lot of packages according to the log.
** Package changed: rhythmbox-ubuntuone-music-store (Ubuntu) => gconf2 (Ubuntu) ** Changed in: gconf2 (Ubuntu) Status: New => Triaged -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gconf2 in ubuntu. https://bugs.launchpad.net/bugs/578071 Title: package rhythmbox-ubuntuone-music-store 0.0.9-0ubuntu1 failed to install/upgrade: subprocess installed post-removal script returned error exit status 1 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs