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ubuntu wiki LightDM states:

LighDM configuration is governed by the lightdm.conf file, however it's not suppose to be directly edited, instead use:

lightdm-set-defaults

$ lightdm-set-defaults
lightdm-set-defaults: command not found
$ sudo lightdm-set-defaults
sudo: lightdm-set-defaults: command not found
$ lightdm -v
lightdm 1.4.0

synaptic 0.75.12 'Quick filter' finds no matches on 'lightdm-set-defaults'.

How do I install 'lightdm-set-defaults'?

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I experience the issue where the command isn't installed. Are you running Ubuntu 13.04 Raring Ringtail or a close variant? I am, and the lightdm-set-defaults functionality is gone. Perhaps it's an issue that will be resolved prior to the final release in April? –  user141525 Mar 19 '13 at 1:12
    
lightdm-set-defaults is probably not on your PATH Try: sudo /usr/lib/lightdm/lightdm-set-defaults –  coldeq Apr 21 '13 at 21:12
    
@coldeq make that an answer. –  C.W.Holeman II May 9 '13 at 20:24

3 Answers 3

As of Ubuntu Trusy 14.04, lightdm-set-defaults is no longer available. This is because lightdm now using a configuration directory /etc/lightdm/lightdm.conf.d/ rather than a single configuration file. The files in this directory can be edited by hand, new files can be added, or files can be removed. There is no longer any need for a command that edits the single configuration file.

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so how can i set values in /etc/lightdm/lightdm.conf.d/ to defaults? –  neckTwi May 25 at 15:26
    
To restore all the lightdm configuration files to their default value, see the answer on this question: askubuntu.com/questions/66533/… –  Stephen Ostermiller May 25 at 17:11

As you can see by searching the packages.ubuntu.com website, it's a command, provided by the lightdm package, which you already have I assume.

So, just run in a terminal:

sudo lightdm-set-defaults
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The command is not in the path so you need to run it using the full name, i.e.:

/usr/lib/lightdm/lightdm-set-defaults

The Wiki page is incorrect - you can edit the configuration if you want, the purpose of lightdm-set-defaults is so scripts can easily modify the configuration.

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