I'm running Lubuntu 16.04. After running the system for a while the wireless internet will stop working.

Dutifully, I run:

sudo service network-manager restart

But this returns the message:

Failed to add /run/systemd/ask-password to directory watch: No space left on device

But I have lots of space available on the hard disk, in RAM, and via swap. What's going on?


As discussed here, it turns out that the Crashplan back-up service is the most likely culprit. It uses many inotify watches and, eventually, eats them all up.

The immediate fix is to run:

sudo -i
echo 1048576 > /proc/sys/fs/inotify/max_user_watches

To make more watches available.

The long-term fix is to edit the file /etc/sysctl.conf to include the line:


Edit: It's been a few days now, and the problem hasn't arisen since I performed the above.

  • Are there any updates - is the fix still working? Or is there a Crashplan bug that needs addressing? Thanks! – Giles B Oct 6 '16 at 16:43
  • @GilesB: I have not had a problem with my internet since, so I believe this solved the problem. It would be handy if Crashplan checked this value and alerted the user to potential problems before they arose. – Richard Oct 7 '16 at 2:31
  • 1
    The solution described above remains the recommended solution on CrashPlan's support site: support.code42.com/CrashPlan/4/Troubleshooting/… – kiprainey Oct 21 '16 at 13:54
  • as up to date the problem still exist and the max_user_watches hasn't solved it unfortunately – Oleg Kokorin Jul 4 '18 at 15:15
  • may sudo sysctl -p will help. code.visualstudio.com/docs/setup/… – SohelAhmedM Oct 26 '18 at 16:18

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