The excerpt from the changelog quoted above explains it:
powermanagement-interface (0.3.16) gutsy; urgency=low
* pmi.acpi: Disable suspend and hibernate if /host is mounted via fuse;
disable hibernate if a swap file is active.
-- Colin Watson <[EMAIL PROTECTED]> Wed, 29 Aug 2007 18:40:49 +0100
Try
$ grep ' /host fuse' /proc/mounts
If there is an entry matching that, the changes shown above will cause
suspend and hibernate to be disabled.
** Changed in: powermanagement-interface (Ubuntu)
Assignee: (unassigned) => TJ
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Hibernate missing from shutdown menu after 30/08/07 updates
https://bugs.launchpad.net/bugs/136433
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