Xilinx does not deliver drivers to support any type of USB dongle for licensing on Linux operation systems.
Although not officially supported, some customers have reported that they are able to install and successfully use Linux FlexID-9 dongle drivers for FLEX licensing.
You can download the latest version from Flexera:
Typically, the FLEX licensing works as long as the dongle is recognized on the system.
Type "lmutil lmhostid -flexid" to get the dongle FLEX ID and to check if the dongle is recognized.