Comment 3 for bug 1574004

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Davide Alberelli (dadexix86) wrote : Re: package udev 229-4ubuntu4 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

I have a workaround for this.

Since the error is "rm: cannot remove '/var/log/udev': Is a directory" what I did was to manually remove the folder

    sudo rm -r /var/log/udev
and then restart the configuration of the packages with

    sudo dpkg --configure -a

This led to a successfull upgrade to 16.04.