As the page you linked to says, you need to downgrade the X server to use the Legacy driver with Ubuntu 13.04. The makson96 PPA offers a way to do that, but you do not have it installed (and it's not officially supported or recommended by Ubuntu to downgrade critical packages like that). As such, I'm marking this bug a duplicate. Thanks.
As the page you linked to says, you need to downgrade the X server to use the Legacy driver with Ubuntu 13.04. The makson96 PPA offers a way to do that, but you do not have it installed (and it's not officially supported or recommended by Ubuntu to downgrade critical packages like that). As such, I'm marking this bug a duplicate. Thanks.