A lot of people have complained that they have a machine which is working for everything but doesn't have, or can't get to work, wifi.
We bought some wifi dongles to test, and have at least one we can confirm works on v46.1 -
Go buy it today if you need one!!!
UPDATE: The D-Link DWA-160 works with dual band Wireless Access Points (can transmit on both 5GHz and 2.4GHz wireless band).
The following other Dongles have been tested as working as of v54.2
Uplevel UA-210WN (may have low signal strength)
Netis WF2120 (2.4GHz only)
D-Link DWA-121 (2.4GHz only)
Plugable USB-WIFINT (2.4GHz only)