Comment 11 for bug 1237042

I also have this problem with Ubuntu 16.04 LTS.

ureadahead.service - Read required files in advance
   Loaded: loaded (/lib/systemd/system/ureadahead.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Fri 2016-05-13 06:12:57 AEST; 13min ago
  Process: 73 ExecStart=/sbin/ureadahead (code=exited, status=5)
 Main PID: 73 (code=exited, status=5)

May 13 06:12:57 XXX ureadahead[73]: ureadahead: Error while tracing: No such file or directory
May 13 06:12:57 XXX ureadahead[73]: Counted 4 CPUs
May 13 06:14:01 XXX systemd[1]: Stopped Read required files in advance.
Warning: Journal has been rotated since unit was started. Log output is incomplete or unavailable.

XXX:~$ lsb_release -rd
Description: Ubuntu 16.04 LTS
Release: 16.04
XXX:~$ apt-cache policy ureadahead
ureadahead:
  Installed: 0.100.0-19
  Candidate: 0.100.0-19
  Version table:
 *** 0.100.0-19 500
        500 http://ports.ubuntu.com xenial/main armhf Packages
        100 /var/lib/dpkg/status
XXX:~$