I've found that this happens only when I connect to the Ubuntu machine
using NX (with the "Desktop" setting set to Unix -> GNOME).  If I log in
locally or use the "Shadow" option of NX that connects to an existing
console session, the unlock button works fine.

Through NX I get the same "Unable to look up session information for
process" error when I launch network-admin from a terminal (I haven't
tried users-admin) and have the "Unlock" button greyed out.  Also, the
/etc/hosts suggestions above didn't help me (although I tried them
before trying to use network-admin locally, so it's possible that the
hosts changes *and* logging in locally fixed it...).

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'Unlock' button in admin utilities greyed out
https://bugs.launchpad.net/bugs/231246
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