Comment 117 for bug 349469

As in #111 but on 15.10.
I got this error after the "Add printer driver"-UI hanged while trying to add openprinting-gutenprint.

This is the process locking the config.dat:
        |-aptd-+-aptd-+-dpkg
        | | `-sh---dpkg-preconfigu---dpkg-preconfigu

I had tried to install the printer driver three times.
So when I found this bug report two days later, I had to run `sudo fuser -vik /var/cache/debconf/config.dat` three times.
Apparently they were waiting in some queue and locked the file (and then hanged) when I kill the current locking process.