I permanently can activate the timer on my system with the command
systemctl enable --now fstrim.timer
So I don’t really see a problem…
But this didn’t happen automatically after the installation. Now I checked my installation log from summer 2020 to see what there was going on. Check it out for yourself:
…
Target cmd: (“systemctl”, “enable”, “fstrim.timer.service”) output:
Failed to enable unit, unit fstrim.timer.service does not exist.
2020-07-03 - 21:12:20 [2]: void CalamaresPython::warning(const string&)
WARNING:[PYTHON JOB]: “Cannot enable systemd .service fstrim.timer”
2020-07-03 - 21:12:20 [2]: void CalamaresPython::warning(const string&)
WARNING:[PYTHON JOB]: “systemctl enable call in chroot returned error code 1”
…