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 Touch seeded packages, which is subscribed to util-linux in Ubuntu. https://bugs.launchpad.net/bugs/1932305 Title: fstrim doesn't trim my /home separate partition Status in util-linux package in Ubuntu: Confirmed Bug description: My system is Kubuntu 20.04 I have 3 partitions in my nvme: NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT nvme0n1 259:0 0 465,8G 0 disk ├─nvme0n1p1 259:1 0 251M 0 part /boot/efi ├─nvme0n1p2 259:2 0 53,7G 0 part / ├─nvme0n1p4 259:3 0 7,6G 0 part [SWAP] └─nvme0n1p5 259:4 0 357G 0 part /home I have activated fstrim.service and fstrim.timer: sudo systemctl list-timers ... Mon 2021-06-21 00:00:00 CEST 3 days left Mon 2021-06-14 00:00:03 CEST 3 days ago fstrim.timer fstrim.service But home partition is not trimmed: ... jun 14 00:00:10 moon fstrim[5137]: /: 29,1 GiB (31264600064 bytes) trimmed on /dev/nvme0n1p2 jun 14 00:00:10 moon fstrim[5137]: /boot/efi: 239,1 MiB (250755584 bytes) trimmed on /dev/nvme0n1p1 jun 14 00:00:10 moon systemd[1]: fstrim.service: Succeeded. ... The fstrim.service is Protected for home: sudo systemctl cat fstrim.service # /lib/systemd/system/fstrim.service [Unit] Description=Discard unused blocks on filesystems from /etc/fstab Documentation=man:fstrim(8) ConditionVirtualization=!container [Service] Type=oneshot ExecStart=/sbin/fstrim --fstab --verbose --quiet ProtectSystem=strict ProtectHome=yes PrivateDevices=no PrivateNetwork=yes PrivateUsers=no ProtectKernelTunables=yes ProtectKernelModules=yes ProtectControlGroups=yes MemoryDenyWriteExecute=yes SystemCallFilter=@default @file-system @basic-io @system-service I think the problem is: https://github.com/karelzak/util-linux/commit/61b384b36105fe682ddf16b9379f446d935603bc To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/1932305/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
