Even though you have a WUSB54GC v3 are you sure it has the chip Bus 001 Device 002: ID 1737:0077 Linksys? Check it with lsusb in a terminal.
I finally got mine (v3 version also) working yesterday after many months of hacking at it. These are the only things that I needed to have/do:
1) An updated copy of Lucid Lynx.
2) Blacklist rt2800usb in /etc/modprobe.d/blacklist.conf
3) Change the WPA protocol from AES+TKIP to AES in my router.
This thread http://ubuntuforums.org/showthread.p...155941&page=26 (last couple of pages) may help you.
Hope it works for you.
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