Comment 9 for bug 1237042

I also have this problem with Ubuntu 15.10, same output as Nicolas:

$ sudo systemctl status ureadahead
● ureadahead.service - Read required files in advance
   Loaded: loaded (/lib/systemd/system/ureadahead.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Sat 2016-01-30 07:07:07 GMT; 15min ago
  Process: 233 ExecStart=/sbin/ureadahead (code=exited, status=5)
 Main PID: 233 (code=exited, status=5)

Jan 30 07:07:07 dicer2 ureadahead[233]: ureadahead: Error while tracing: No such file or directory
Jan 30 07:07:07 dicer2 ureadahead[233]: Counted 2 CPUs
Jan 30 07:08:19 dicer2 systemd[1]: Stopped Read required files in advance.