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I'm using Xubuntu and now the login dialog box shows Guest instead of my login name. I've been all over the net and read what lightdm documentation I could find but have not found a solution, let alone how the greeter decides what to put up on that login dialog box. Can anyone provide some guidance?

EDIT: It seems that the problem is caused by a UID less than 1000, although changing the UID back to 1000 does not revert the behavior - the greeter wants to login a guest.

2 Answers2

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The greeter ignores users with UIDs of under 1000, so when you changed your user's UID to less than that, it disappeared. I personally recommend that you fix it by putting its UID back. If you can't do that, How to make users with UID under 1000 appear in LightDM? gives some ways that apparently will let you show it anyway.

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From the Recovery Mode you can add another user to your login screen using these steps.
(Press ESC when booting to bring up the grub menu.)

Bring up the grub boot menu.

(Select) Advance -> ENTER -> (select) Recovery Mode -> ENTER -> (select) Drop to root shell prompt -> ENTER -> ENTER

At the prompt type these commands:

# mount -o remount,rw /
# adduser testuser
# addgroup testuser sudo
# exit

Now on the GUI continue with:

(Select) Resume -> ENTER -> ENTER

Now login using the newly created account and perform your maintenance.

L. D. James
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