This is a non-standard installation of Ubuntu 18.04, the ELAR Arm based Ubuntu distribution with RockChip support for boards such as the Asus tinkerboard. The Problem, and solution, may not apply to your case, or other Mainline Ubunutu distributions.
For some wacky unknown reason, I have a cron job that is not running, so I started digging around, and found a not on NixCraft website, that says i might need to enable cron using systemctl. Ok fine, there is an example, so i try it. I authenticate, and it proceeds to fail.
# systemctl enable cron.service Synchronizing state of cron.service with SysV service script with /lib/systemd/systemd-sysv-install. Executing: /lib/systemd/systemd-sysv-install enable cron
looks like cron service is enabled right? well, on boot then,
@reboot /usr/bin/motion -b should run, but it doesn't. I looked int
and see a spot where it looks like cron fails, but Im not sure what to do next.
Jun 17 04:08:37 ELAR-Systems systemd: Reloading. Jun 17 04:08:37 ELAR-Systems systemd: message repeated 2 times: [ Reloading.] Jun 17 04:09:01 ELAR-Systems cron: Authentication token is no longer valid; new one required Jun 17 04:09:01 ELAR-Systems CRON: Authentication token is no longer valid; new one required
Wondering how to fix this....