I just wanted to post that I am using Line 6 Guitarport to record guitar in Ubuntu Studio 9.04.

With the drivers obtained here, using the supplied instructions, I compiled the usb driver, fired up Ardour, selected guitarport as the sound device and immediately had sound.

Adding a new track and enabling record I was pleased to find that the latency is almost non-existent and the sound is great!

The latency is actually better than in Winblows on the same machine!

Please check out the Sourceforge project.

Also, guitarists add your voice here and kindly ask Line 6 for Linux support.