This is due to "ProtectHome=yes" in the .service file; the workaround is to add:
[Service] ProtectHome=no In e.g. /etc/systemd/system/fstrim.service.d/allow-home.conf -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1932305 Title: fstrim doesn't trim my /home separate partition To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/1932305/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs