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Ensure that numlockx is installed:
sudo apt-get install numlockx
Edit the file /etc/lightdm/lightdm.conf
gksudo gedit /etc/lightdm/lightdm.conf
Add the following line to the file:
greeter-setup-script=/usr/bin/numlockx on
Source page: http://askubuntu.com/a/128038
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原文地址：http://www.cnblogs.com/Jim-william/p/5207620.html
