我需要帮助：我在 14.04 上，我昨天做了 2 次发布升级，第一次升级到 14.10，升级没问题，后来升级到 15.04（升级不太好）：最后需要重新启动它冻结黑屏，键盘没反应。我强迫它关闭并在重新启动时一切正常，但是 avahi-daemon/avahi-utils 一直显示错误：
$ aptitude update u0026u0026 aptitude dist-upgrade`
The following packages
Partially installed will be configured: avahi - daemon
Avahi - utils No packages will be installed, upgraded or removed.
0 upgraded, 0 newly installed, 0 to remove and 0 not
Updated. You need to get 0 B stock. After extraction,
0 will be occupied B. Configuring avahi - daemon
(0.6.31-4ubuntu4)... update-rc.d: warning: start and stop actions are
no longer supported; falling back …