Same for me on 12.04 32 bit.
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Title:
samba guest account appears in list of users
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This shouldn't have been changed to the lightdm package as I was using
gdm when I saw this.
** This bug is no longer a duplicate of bug 857651
Unable to hide users from login screen / user switcher
** Package changed: lightdm (Ubuntu) = gdm (Ubuntu)
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** Package changed: gdm (Ubuntu) = lightdm (Ubuntu)
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https://bugs.launchpad.net/bugs/814139
Title:
samba guest account appears in list of users
To manage notifications
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gdm (Ubuntu)
Status: New = Confirmed
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could be a duplicate of one of the other list system users bugs open
** Changed in: gdm (Ubuntu)
Importance: Undecided = Low
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https://bugs.launchpad.net/bugs/814139