After entering "WMP54G ubuntu" in DuckDuckGo, the first result is
http://wiki.linuxquestions.org/wiki/WMP54G_Wireless_how-to_for_Ubuntu_8.10
It is written "The necessary ucode4.fw firmware is not included on the Ubuntu
LiveCD because of copyright issues." However, I have read that Broadcom (the
chipset manufacturer of your card) has recently (after the release of the
kernel Trisquel 4.5 uses) changed its licensing to be compatible with the GPL
( http://thread.gmane.org/gmane.linux.kernel.wireless.general/55418 ). That
is why I took a look at the driver source code:
http://bu3sch.de/b43/fwcutter/b43-fwcutter-014.tar.bz2
The license looks OK (i.e., respects your freedoms). However the file
fwcutter_list.h includes some non-understandable (although not that long)
structs that *might* be considered proprietary blobs. If I were you, I would
try Trisquel 5.0 alpha ( http://devel.trisquel.info/dagda/iso/ ) and see if
the card works in the Live system. That would mean the freedom issues were
fixed.
