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Installed kdm and used it as default. After i login into unity through i do not see my username.But if i go back to using lightdm, i have no problems.

Anyone knows how to use kdm as default and still not lose username in unity..?

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Was it present when you first installed / updated to Ubuntu 12.04 ? – david6 May 23 '12 at 7:48
yes it was present.. – tanmay.01 May 27 '12 at 6:25
Mine disappeared on 11.10 (after some update), but is present on new install of 12.04 LTS (so far) .. – david6 May 27 '12 at 6:28

To re-enable the username on Unity panel, in terminal:

gsettings set com.canonical.indicator.session show-real-name-on-panel true

To disable, simply change true to false:

gsettings set com.canonical.indicator.session show-real-name-on-panel false

Note: You must reboot for these changes to take effect.

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I did say it in the question this is not working – tanmay.01 May 23 '12 at 3:38
@tanmay.01 If you were referring to the GUI for dconf, there shouldn't be an option for session under com > canonical > indicator, although I do not know why. But the show-real-name-on-panel boolean key should definitely work in defining the state of your username in the panel. Please give the commands a try in your terminal, and be sure to reboot. Get back to me! :) – loklaan May 23 '12 at 5:35
Nope .. its not working.. in last 1 year this is the first time unity is troubling me.. – tanmay.01 May 23 '12 at 6:32

This happened to me once-- Try this command in Terminal:

sudo apt-get install indicator-session

What may have happened is that the package was deleted. Like I said, it happened once to me, so thiS MAY (I can't stress that word enough) work for you. :)

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yes tried this also ...but in wain – tanmay.01 May 23 '12 at 7:08

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