According to page 5 of the manual for your Dell display -->
https://dl.dell.com/manuals/all-products/esuprt_electronics/esuprt_display/dell-u3011_user's%20guide_en-us.pdf the display has a dual-link DVI video input.
According to this DisplayLink knowledge base article (look all the way at the bottom) -->
https://support.displaylink.com/know...lution-support dual-link DVI displays are not supported by DisplayLink.