The issue is on my workstation which might have all kind of config history. On a fresh focal system it looks like "default off, start works"
root@f:~# systemctl status rtkit-daemon ● rtkit-daemon.service - RealtimeKit Scheduling Policy Service Loaded: loaded (/lib/systemd/system/rtkit-daemon.service; disabled; vendor preset: enabled) Active: inactive (dead) root@f:~# systemctl start rtkit-daemon.service root@f:~# systemctl status rtkit-daemon ● rtkit-daemon.service - RealtimeKit Scheduling Policy Service Loaded: loaded (/lib/systemd/system/rtkit-daemon.service; disabled; vendor preset: enabled) Active: active (running) since Wed 2020-04-08 06:12:27 UTC; 1s ago Main PID: 76699 (rtkit-daemon) Tasks: 3 (limit: 38284) Memory: 684.0K CGroup: /system.slice/rtkit-daemon.service └─76699 /usr/libexec/rtkit-daemon Apr 08 06:12:27 f systemd[1]: Starting RealtimeKit Scheduling Policy Service... Apr 08 06:12:27 f systemd[1]: Started RealtimeKit Scheduling Policy Service. Apr 08 06:12:27 f rtkit-daemon[76699]: Successfully called chroot. Apr 08 06:12:27 f rtkit-daemon[76699]: Successfully dropped privileges. Apr 08 06:12:27 f rtkit-daemon[76699]: Successfully limited resources. Apr 08 06:12:27 f rtkit-daemon[76699]: Running. Apr 08 06:12:27 f rtkit-daemon[76699]: Canary thread running. Apr 08 06:12:27 f rtkit-daemon[76699]: Watchdog thread running. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to rtkit in Ubuntu. https://bugs.launchpad.net/bugs/1871543 Title: rtkit fails to start in focal "pthread_create failed: Resource temporarily unavailable" Status in rtkit package in Ubuntu: New Bug description: I was debugging something else and found rtkit broken on my system. Apr 08 06:09:22 Keschdeichel rtkit-daemon[1726502]: Successfully called chroot. Apr 08 06:09:22 Keschdeichel rtkit-daemon[1726502]: Successfully dropped privileges. Apr 08 06:09:22 Keschdeichel rtkit-daemon[1726502]: Successfully limited resources. Apr 08 06:09:22 Keschdeichel rtkit-daemon[1726502]: pthread_create failed: Resource temporarily unavailable Apr 08 06:09:22 Keschdeichel rtkit-daemon[1726502]: Canary thread running. Apr 08 06:09:22 Keschdeichel rtkit-daemon[1726502]: Exiting canary thread. Apr 08 06:09:22 Keschdeichel rtkit-daemon[1726502]: Demoting known real-time threads. Apr 08 06:09:22 Keschdeichel rtkit-daemon[1726502]: Demoted 0 threads That state is reproducible through restarts. I haven't looked any further yet. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: rtkit 0.12-4 ProcVersionSignature: Ubuntu 5.3.0-45.37~18.04.1-generic 5.3.18 Uname: Linux 5.3.0-45-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.11-0ubuntu24 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Wed Apr 8 07:59:58 2020 InstallationDate: Installed on 2018-10-12 (543 days ago) InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) SourcePackage: rtkit UpgradeStatus: Upgraded to focal on 2020-04-03 (4 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rtkit/+bug/1871543/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp