Comment 9 for bug 1404783

Had this today. I upgraded from 14.04 to 14.10 to 15.04 and somewhere along the line I started getting messages such as

   Errors were encountered while processing:
    cups-client
    printer-driver-postscript-hp
    printer-driver-foo2zjs
    cups-bsd
    cups

and

   W: Unknown Multi-Arch type 'no' for package 'compiz-core'
   W: Unknown Multi-Arch type 'no' for package 'compiz-gnome'
   W: Unknown Multi-Arch type 'no' for package 'compiz-core'
   W: Unknown Multi-Arch type 'no' for package 'compiz-gnome'
   W: You may want to run apt-get update to correct these problems

Unfortunately I didn't document the exact steps I took to resolve the issue, but it was a combination of

    dpkg --configure -a

and

    apt-get install -f

and then going into synaptic and upgrading 'apt' and 'apt-utils'

I then used synaptic (as I was in there) to mark all upgrades, and it wen through (with a fair smattering of warnings) to completion.

I had an error message at the end:

   zram-config there is no script in the new version of the package

but closed that and then re-ran apt-get update, apt-get upgrade - nothing else to install, so rebooted and everything came up OK.

Clearly the apt-get issue identified above was causing a conflict, but a combination of the above sorted it for me. Vivid now running nicely!