FYI, gksu (as of libgksu version 2.0.11) allocates a new pseudoterminal,
runs sudo -v to acquire a token, then uses g_spawn_sync in the parent
process once the authentication is successful. (This allows gksu to be
executed with the 'Defaults requiretty' option, which is enabled by
default on RHEL.) Obviously, this fix doesn't work properly with the
tty_tickets option. I'm going to write another patch to try and address
this issue.

Until then, I wouldn't be using the new libgksu in Karmic!

-- 
sudo option "tty_tickets" gives false sense of security due to reused pts 
numbers
https://bugs.launchpad.net/bugs/87023
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