[SOLVED] Aptitude: Unable to resolve dependencies. No more solutions.

This is first time I got this error: "Unable to resolve dependencies. No more solutions.", when trying Upgrade.
Packages with unresolved dependencies are:

libperl5.20
libperl5.20:i386
perl-base
perl-base:i386

they seem to conflict with each other, in circle.
what to do? thanks.

Are you upgrading from 1 distro to another, wheezy to jessie?

I had the same issue during a normal aptitude update, following testing (stretch).

I was able to resolve it by removing libperl5.20:i386 (I have multiarch configured, but no longer need it)

I don't know what the "correct" solution is, but this worked for me...

yeah, I'm using testing_amd64 too. sorry forgot to mention that, but by now everyone here probably knows it.
I've removed libsane:i386, no more dependency problems.

one of the solutions to this problem is to wait a while. doesn't sound sexy but works.