This is because you removed /var/lib/mythtv/recordings.
It is included in the package, so not a bug in the package
~$ dpkg -L mythtv-backend | grep /mythtv/recordings
/var/lib/mythtv/recordings
** Changed in: mythtv (Ubuntu)
Status: New => Won't Fix
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package mythtv-backend 0.21.0+fixes16838-0ubuntu3 failed to install/upgrade:
subprocess post-installation script returned error exit status 1
https://bugs.launchpad.net/bugs/223988
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