dpkg: error processing libc6 (--configure):libc6:amd64 2.15-0ubuntu10.3 cannot be configured because libc6:i386 is in a different version (2.13-20ubuntu5.3)
(Re)move the /etc/dpkg/dpkg.cfg.d/multiarch file; remove every *:i386 package. Then try again.
Are you sure your Brigantia installation was up-to-date before doing the upgrade? AFAIK, if it was, it should remove that automatically.
