Running 14.04.1 LTS (kernel 3.13.0-53)
Since updating to 3.13.0-53 the hibernate menu option has gone awol. I have tested that
pm-hibernate still works and that swap is larger than memory. I did notice that the polkit-1 override had mysteriously disappeared and so I replaced it.
$ ls -l /etc/polkit-1/localauthority/50-local.d/ total 4 -rw-r--r-- 1 root root 244 May 20 18:47 com.ubuntu.enable-hibernate.pkla
I know there are plenty of similar questions been asked before and I have searched most of them for an answer to no avail.
So what has broken it?