Till I figured out it had some protective film on the edge connector...
Did it had a label attached to it saying
Peel off before installationI have a usb 3 addon card and it doesn't show up in LL....Is usb 3 supported?
As an extra addition to the answers of Wirezfree. A USB device can be recognized as following (using your problem to identify USB 3.0)
Bus *** Device ***: ID xxxx:yyyy Linux Foundation 3.0 root hub
So if you enter one of the mentioned terminal commands, look for a value similar as i proved. If you see a line ending with
Linux Foundation 3.0 root hub then you now you have USB 3.0 support.
Linux started supporting USB 3.0 since kernel version 2.6.31, released in 2009.