I had a quick skim through this thread, but I couldn't see anything related to my issue, I have the stable flavour of CSSU installed:

I can't seem to install any of the dependencies (debs posted in this thread) that backupmenu-multiboot requires, I upgraded multiboot to 0.2.11 fine, but i cant install i2c-tools or mtd-utils, it says "incompatible package"

I have tried installing i2c-tools from the repo itself, but still no joy. Anyone else had this issue?