Please hold back from dist-upgrades until further notice!
There seems to be a serious issue with lsb and maybe other packages affected which renders your system unusable.

If you got caught by this bug in dmsetup (<a href=http://bugs.debian.org/491107>#491107, #491114), please follow the steps below (fixed packages are in sidux' repositories):

• try to find an older, still installed, kernel with an unaffected initrd, select it and just head over to the steps starting with apt-get update below
• if you're not lucky to find a still booting kernel, restart your system and wait a few minutes, while it seems to freeze at "Begin: Waiting for root file system...", the initramfs will time out after a little while (less than 5 minutes) and drop you to a very limited busybox shell, once there please follow the next steps
  • rm /etc/udev/rules.d/65_dmsetup.rules # you can use [tab] expansions here
  • udevadm trigger # you most likely won't see a prompt, after udev has enumerated your devices - just type ahead when it stops scrolling down (if you don't see any output here, just wait ~2 minutes)
  • exit
• get to tty1 --> press [alt]+[ctrl]+[f1]
• log in as root
• apt-get update
• apt-get install dmsetup lsb-base # make sure to get dmsetup >= 2:1.02.27-2+c0.sidux.1 and lsb-base >= 3.2-15
• update-initramfs -u
• reboot

Now everything should be in order.

if you already dist-upgraded within the last 24h, don't reboot and make sure to update to dmsetup >= 2:1.02.27-2+c0.sidux.1 and lsb-base >= 3.2-15 before powering down!