The 'guest' user created by gdm-guest-session is a passwordless system
user by design, and gksu fails when trying to prompt for a password. One
way to make the error dialog appear might be that gksu checks whether
the GDMSESSION environment variable equals 'guest-restricted', and skips
the password prompting attempt if it does.
** Also affects: gksu (Ubuntu)
Importance: Undecided
Status: New
** Changed in: gksu (Ubuntu)
Status: New => Confirmed
** Changed in: gdm-guest-session (Ubuntu)
Status: New => Confirmed
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gksu and sudo broken in guest session
https://bugs.launchpad.net/bugs/604180
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