I have tried
sudo touch /forcefsck
Then I reboot, and the file disappears, but no disk check appears to have taken place. The whole boot process takes under 10 seconds!
Then I tried this to force it to reboot every day:
sudo tune2fs -i 1 /dev/sda1
To verify, I ran this:
sudo dumpe2fs -h /dev/sda1
The relevant lines of output are:
Last checked: Sun Sep 4 12:15:45 2016
Check interval: 86400 (1 day)
Next check after: Mon Sep 5 12:15:45 2016
Running "date" I see my clock says it is currently Dec 19, 2016, so fsck should run on the next boot up. But after I reboot it is again really fast and rerunning dumpe2fs I see the same exact text above, suggesting it never even tried to run fsck.
How can I force fsck to run at boot-up?