Comment 14 for bug 124373

I'm experiencing the same problem, only running dpkg --configure -a doesn't solve the problem:

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kees@ubuntu:~$ sudo dpkg --configure -a
Setting up system-tools-backends (2.6.0-1ubuntu1.1) ...
 * Starting System Tools Backends system-tools-backends
invoke-rc.d: initscript system-tools-backends, action "start" failed.
dpkg: error processing system-tools-backends (--configure):
 subprocess post-installation script returned error exit status 1
dpkg: ../../src/packages.c:221: process_queue: Assertion `dependtry <= 4' failed.
Aborted
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Does anyone has got any idea how to fix this?