The gksu dependency has been dropped:
https://launchpad.net/ubuntu/+source/mythtv/2:29.1+fixes.20180412.329c235-0ubuntu1
** Changed in: mythtv (Ubuntu)
Status: Confirmed => Fix Released
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: mythtv (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1740620
Title:
** Description changed:
gksu has been deprecated and unmaintained for several years. It is
recommended for app developers to use PolicyKit to run the specific
actions that need elevated privileges instead of running the entire app
as root.
Ubuntu 17.10's default desktop (a themed