This was fixed in thermald 2.5.3-2 in Debian. I don't really understand how changes make their way from Debian to Ubuntu, but it doesn't look like this version was ever imported into Ubuntu.
** Bug watch added: Debian Bug tracker #864502 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=864502 ** Also affects: thermald (Debian) via https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=864502 Importance: Unknown Status: Unknown -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1993566 Title: dbus-daemon: Unknown group "power" in message bus configuration file To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thermald/+bug/1993566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs