Installed KDE Neon (Based on Ubuntu 20.04LTS), installed openjdk 11 and the Jenkins 2.263.4. Installation went ok until the installer attempted to start jenkins (systemctl start jenkins).

Error:

Konfigurowanie pakietu jenkins (2.263.4) ...
Job for jenkins.service failed because the control process exited with error code.
See "systemctl status jenkins.service" and "journalctl -xe" for details.
invoke-rc.d: initscript jenkins, action "start" failed.
● jenkins.service - LSB: Start Jenkins at boot time
    Loaded: loaded (/etc/init.d/jenkins; generated)
    Active: failed (Result: exit-code) since Sat 2021-02-27 16:56:24 CET; 5ms ago
      Docs: man:systemd-sysv-generator(8)
   Process: 15709 ExecStart=/etc/init.d/jenkins start (code=exited, status=7)

lut 27 16:56:23 krzysiek-KDENeon-AIO-520-24ICB systemd[1]: Starting LSB: Start Jenkins at boot time...
lut 27 16:56:23 krzysiek-KDENeon-AIO-520-24ICB jenkins[15709]: Correct java version found
lut 27 16:56:23 krzysiek-KDENeon-AIO-520-24ICB jenkins[15709]:  * Starting Jenkins Automation Server jenkins
lut 27 16:56:23 krzysiek-KDENeon-AIO-520-24ICB su[15764]: (to jenkins) root on none
lut 27 16:56:23 krzysiek-KDENeon-AIO-520-24ICB su[15764]: pam_unix(su-l:session): session opened for user jenkins by (uid=0)
lut 27 16:56:23 krzysiek-KDENeon-AIO-520-24ICB su[15764]: pam_unix(su-l:session): session closed for user jenkins
lut 27 16:56:24 krzysiek-KDENeon-AIO-520-24ICB jenkins[15709]:    ...fail!
lut 27 16:56:24 krzysiek-KDENeon-AIO-520-24ICB systemd[1]: jenkins.service: Control process exited, code=exited, status=7/NOTRUNNING
lut 27 16:56:24 krzysiek-KDENeon-AIO-520-24ICB systemd[1]: jenkins.service: Failed with result 'exit-code'.
lut 27 16:56:24 krzysiek-KDENeon-AIO-520-24ICB systemd[1]: Failed to start LSB: Start Jenkins at boot time.
dpkg: błąd przetwarzania pakietu jenkins (--configure):
podproces zainstalowany pakiet jenkins skrypt post-installation zwrócił kod błędu 1
Wystąpiły błędy podczas przetwarzania:
jenkins
E: Sub-process /usr/bin/dpkg returned an error code (1)

Log from journalctl -xe

– Jednostka packagekit.service pomyślnie przeszła do stanu „dead” (martwego).
lut 27 17:04:35 krzysiek-KDENeon-AIO-520-24ICB sudo[16160]: krzysiek : TTY=pts/1 ; PWD=/home/krzysiek ; USER=root ; COMMAND=/bin/systemctl >
lut 27 17:04:35 krzysiek-KDENeon-AIO-520-24ICB sudo[16160]: pam_unix(sudo:session): session opened for user root by (uid=0)
lut 27 17:04:35 krzysiek-KDENeon-AIO-520-24ICB sudo[16160]: pam_unix(sudo:session): session closed for user root
lut 27 17:05:20 krzysiek-KDENeon-AIO-520-24ICB sudo[16171]: krzysiek : TTY=pts/1 ; PWD=/home/krzysiek ; USER=root ; COMMAND=/bin/journalctl>
lut 27 17:05:20 krzysiek-KDENeon-AIO-520-24ICB sudo[16171]: pam_unix(sudo:session): session opened for user root by (uid=0)
lut 27 17:05:20 krzysiek-KDENeon-AIO-520-24ICB sudo[16171]: pam_unix(sudo:session): session closed for user root
lut 27 17:05:25 krzysiek-KDENeon-AIO-520-24ICB sudo[16173]: krzysiek : TTY=pts/1 ; PWD=/home/krzysiek ; USER=root ; COMMAND=/bin/journalctl>
lut 27 17:05:25 krzysiek-KDENeon-AIO-520-24ICB sudo[16173]: pam_unix(sudo:session): session opened for user root by (uid=0)