Comment 12 for bug 1237042

The following error could also indicate that your kernel doesn't have the required tracepoints.

ureadahead: Error while tracing: No such file or directory

If you're not running a stock Ubuntu kernel you will need a patch [1] (worked on my 4.14 Debian kernel). Unfortunately, these trace events will not be upstreamed [2].

[1] http://kernel.ubuntu.com/git/ubuntu/ubuntu-xenial.git/commit/?h=hwe&id=7744c33fdad887074a481fd4d21ccb6670ac62e6

[2] https://patchwork.kernel.org/patch/9254717/