"The rumor might have started because Dell's U.S. Ubuntu sales page currently only shows Ubuntu-powered laptops and netbooks without a desktop PC in sight. That's because, according to Anne Camden, a Dell spokesperson, "We are currently transitioning desktop models, moving from the previous generation desktop (Inspiron 530) to a current generation Inspiron desktop. The Ubuntu Linux desktop offering should be back on the Website soon."
"Other sources at Dell tell me that Dell Ubuntu-powered netbooks continue to sell well. Dell will not be leaving desktop Linux."