Nobody here will help you to install non-free stuff in your system. If you
put convenience above Freedom, Trisquel is not for you.
If you can afford it, you could buy a 100% Freedom-friendly piece of hardware
from http://libre.thinkpenguin.com (it sets a cookie to show you only
Freedom-friendly hardware, and to donate 25% of the profits to Trisquel).
People here use to recommend this type of hardware from other places also,
but I know only ThinkPenguin.
Also, probably, you can use an Ethernet cable without problems.