Comment 26 for bug 745011

I had also tried the 'touch /sbin/udevadm.upgrade' workaround, and it failed to work. However, instead of deleting the '--convert-db' line in /var/lib/dpkg/info/udev.postinst, I changed it from:

    udevadm info --convert-db

to:

    udevadm.upgrade info --convert-db

This let the install finish correctly, and the next time I edited the udev.postinst file, dpkg had changed it back to the original. Now back to fixing dependencies and then finishing my upgrade.