Thanks for your report.
Can you please try to reproduce the error with:
sudo apt-get install --reinstall mythweb
and if it's still an issue the run the following :
fuser -v /var/cache/debconf/config.dat
** Changed in: mythplugins (Ubuntu)
Status: New => Incomplete
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package mythweb 0.21.0+fixes18722-0ubuntu1 failed to install/upgrade:
subprocess new post-removal script returned error exit status 1
https://bugs.launchpad.net/bugs/284734
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