Running HomeAssistant on CE

Yes, install will overwrite it. Try edit it after install, then execute

systemctl stop hassio-supervisor.service
systemctl start hassio-supervisor.service

See if there are any error. After that try docker ps to see if container is running.

CoreELEC (official): 19.5-Matrix_rc2 (Amlogic-ng.arm)
-sh: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
Coreelec:~ # systemctl stop hassio-supervisor.service
Warning: The unit file, source configuration file or drop-ins of hassio-supervis                                                                                                             or.service changed on disk. Run 'systemctl daemon-reload' to reload units.
Coreelec:~ # systemctl daemon-reload
Coreelec:~ # systemctl stop hassio-supervisor.service
Coreelec:~ # systemctl start hassio-supervisor.service
Coreelec:~ # docker ps
CONTAINER ID        IMAGE                COMMAND              CREATED                                                                                                                          STATUS              PORTS               NAMES
5f8574e97862        zyclonite/zerotier   "entrypoint.sh -U"   8 days ago                                                                                                                       Up 13 months                            9993-zerotier-one
Coreelec:~ # journalctrl -f
-sh: journalctrl: command not found
Coreelec:~ # journalctl -f
-- Journal begins at Fri 2021-08-06 20:13:19 IST. --
Sep 21 18:28:36 Coreelec systemd[1]: hassio-supervisor.service: Main process exited,                                                                                                              code=exited, status=127/n/a
Sep 21 18:28:36 Coreelec systemd[1]: hassio-supervisor.service: Failed with result '                                                                                                             exit-code'.
Sep 21 18:28:41 Coreelec systemd[1]: hassio-supervisor.service: Scheduled restart jo                                                                                                             b, restart counter is at 23.
Sep 21 18:28:41 Coreelec systemd[1]: Stopped Hass.io supervisor.
Sep 21 18:28:41 Coreelec systemd[1]: Starting Hass.io supervisor...
Sep 21 18:28:41 Coreelec docker[5785]: Error response from daemon: No such container                                                                                                             : hassio_supervisor
Sep 21 18:28:41 Coreelec systemd[1]: Started Hass.io supervisor.
Sep 21 18:28:41 Coreelec hassio-supervisor[5797]: /storage/.opt/sbin/hassio-supervis                                                                                                             or: line 13: docker: command not found
Sep 21 18:28:41 Coreelec systemd[1]: hassio-supervisor.service: Main process exited,                                                                                                              code=exited, status=127/n/a
Sep 21 18:28:41 Coreelec systemd[1]: hassio-supervisor.service: Failed with result '                                                                                                             exit-code'.
Sep 21 18:28:42 Coreelec pulseaudio[3287]: W: [pulseaudio] sap.c: sendmsg() failed:                                                                                                              Connection refused
Sep 21 18:28:46 Coreelec systemd[1]: hassio-supervisor.service: Scheduled restart job, restart counter is at 24.
Sep 21 18:28:46 Coreelec systemd[1]: Stopped Hass.io supervisor.
Sep 21 18:28:46 Coreelec systemd[1]: Starting Hass.io supervisor...
Sep 21 18:28:46 Coreelec docker[5800]: Error response from daemon: No such container: hassio_supervisor
Sep 21 18:28:46 Coreelec systemd[1]: Started Hass.io supervisor.
Sep 21 18:28:46 Coreelec hassio-supervisor[5811]: /storage/.opt/sbin/hassio-supervisor: line 13: docker: command not found
Sep 21 18:28:46 Coreelec systemd[1]: hassio-supervisor.service: Main process exited, code=exited, status=127/n/a
Sep 21 18:28:46 Coreelec systemd[1]: hassio-supervisor.service: Failed with result 'exit-code'.
Sep 21 18:28:51 Coreelec systemd[1]: hassio-supervisor.service: Scheduled restart job, restart counter is at 25.
Sep 21 18:28:51 Coreelec systemd[1]: Stopped Hass.io supervisor.
Sep 21 18:28:51 Coreelec systemd[1]: Starting Hass.io supervisor...
Sep 21 18:28:51 Coreelec docker[5816]: Error response from daemon: No such container: hassio_supervisor
Sep 21 18:28:51 Coreelec systemd[1]: Started Hass.io supervisor.
Sep 21 18:28:52 Coreelec hassio-supervisor[5828]: /storage/.opt/sbin/hassio-supervisor: line 13: docker: command not found
Sep 21 18:28:52 Coreelec systemd[1]: hassio-supervisor.service: Main process exited, code=exited, status=127/n/a
Sep 21 18:28:52 Coreelec systemd[1]: hassio-supervisor.service: Failed with result 'exit-code'.
Sep 21 18:28:52 Coreelec pulseaudio[3287]: W: [pulseaudio] sap.c: sendmsg() failed: Connection refused
Sep 21 18:28:57 Coreelec systemd[1]: hassio-supervisor.service: Scheduled restart job, restart counter is at 26.
Sep 21 18:28:57 Coreelec systemd[1]: Stopped Hass.io supervisor.
Sep 21 18:28:57 Coreelec systemd[1]: Starting Hass.io supervisor...
Sep 21 18:28:57 Coreelec docker[5839]: Error response from daemon: No such container: hassio_supervisor
Sep 21 18:28:57 Coreelec systemd[1]: Started Hass.io supervisor.
Sep 21 18:28:57 Coreelec hassio-supervisor[5850]: /storage/.opt/sbin/hassio-supervisor: line 13: docker: command not found
Sep 21 18:28:57 Coreelec systemd[1]: hassio-supervisor.service: Main process exited, code=exited, status=127/n/a
Sep 21 18:28:57 Coreelec systemd[1]: hassio-supervisor.service: Failed with result 'exit-code'.