I would certainly consider replacing your card with this one instead of messing about with mainline/beta kernels.Logilink also makes a 2-port PCI-Express USB 3.0 card which uses the NEC USB 3.0 chipset that has excellent support in Linux/Ubuntu (it was the first USB 3.0 chipset to come out and the company played an important role in drafting the USB 3.0 standard).
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Simply get another card with better Linux support main board PCIe x4 bus slot - PCI Express 3.0 x4 Lane Host adapter - Supports PCIe.
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#Manhattan usb 3.0 pci express card driver how to
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The VIA VL800 controller used has poor support for Linux