How do I set the login manager to enable `change languages` at login?

How can I recompile the source to force the option to allow changing languages and keyboard layouts at login?

Solution 1:

Did you install the language packs from Language support ?

Update

I seem to have mixed the keyboard layout with the language support!

There is a solution provided in a bug report: Comment #16:

There is now an optional language selector in the GTK greeter for desktops that require it. To enable it set show-language-selector=true in /etc/lightdm/lightdm-gtk-greeter.conf. Fixed in 0.9.8.

Solution

Execute this command:

gksu gedit /etc/lightdm/lightdm-gtk-greeter.conf

Find the line:

#show-language-selector=false

Change it to:

show-language-selector=true

Save and exit. Logout / Login or reboot the machine to apply the effect.

Solution 2:

You can explicitly turn on the language selector in the login screen according to this comment:

To enable it set show-language-selector=true in /etc/lightdm/lightdm-gtk-greeter.conf.