Thank you for the pointer to the debian bug report. The workaround by
disabling the start of Jack by editing the Mumble.ini works also here.
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https://bugs.launchpad.net/bugs/1874231
Title
Public bug reported:
after upgrading from 18.04 to 20.04 starting mumble freezes all audio
applications.
The audio related log at startup:
JACK server starting in realtime mode with priority 10
self-connect-mode is "Don't restrict self connect requests"
Cannot lock down 82280346 byte memory area
