On d-u today sidu-base causes problem. sorry for not being able to exactly tell what happen, but doing d-u init 3 makes me not being able to copy what happen.
Anyway, I did apt-get -f install and then apt-get dist-upgrade again, failed, so I removed sidu-base and then sidu-manual and sidu-disc-center and one more package was removed.
Then d-u and again it failed, apt-get -f install, failed because of missing sidu-base
I Installed sidu-base, sidu-manual and sidu-disc-center , the "one more package" which was removed above was also pulled in by apt
d-u again and now it worked
(xfce 32 bit)