To install xtrlock just follow these instructions.
sudo apt-get install xtrlock
Which will install xtrlock and any other packages on which it depends.
|Maintainer||Matthew Vernon <firstname.lastname@example.org>|
|Description||Minimal X display lock program except the Xlib library. It doesn't obscure the screen, it is completely idle while the display is locked and you don't type at it, and it doesn't do funny things to the X access control lists.|