Your dongle is already supported. If it wasn’t, the system would simply appear as if the dongle were never connected. The issue is simply that the current driver for it is either very flaky, to which @sam_nazarko has said several times lately that overhaul of wireless driver packages is receiving a revamp soon, or the issue is simply a problem of range/interference/incompatibility/misconfiguration among your current networking hardware. Have you tried changing wireless channels in your router?