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lightdm@hemura-X450CC:/home/hemura$ sudo gsettings set com.canonical.unity-greeter draw-grid false
[sudo] password for lightdm: 
Sorry, try again.

i typed the right password but it doesn't work

  • I wonder what the "right password" you typed for the lightdm user is... – kiri Oct 28 '13 at 2:05
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It's a system account. It doesn't have a password.

Why are you even in a shell as the lightdm user? I'd suggest you log out (Control+D) and log in as your own user. If that's in the sudo group, you'll be able to use your own password to run whatever it is you're trying to run as root.

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It seems that you want to remove the Unity Greeter dots. Use the following commands, in that order:

sudo xhost +SI:localuser:lightdm
sudo su lightdm -s /bin/bash
gsettings set com.canonical.unity-greeter draw-grid false
exit

The problem you made was that you prefixed the gsettings command with sudo, which it doesn't need.

Originally by jokerdino♦ here: How do I remove the dots from the lightdm greeter?

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