trouble with apache2 seems still exist. dist-upgrade fails here, because apache2 fails to start, error in configuration file, and I need to remove apache2 and friends
apt-get remove --purge apache2* php5* siguibui sidu-disk-center
running several apt-get -f install then proceed the dist-upgrade
after-wards I reinstall sidu-disk-center php5-json
that ships apache2, but still apache2 fail to start, so configuration didn't get ready (E). I need to reboot and run again apt-get -f install, then apache starts finally.