Thanks for your response.
I'm trying the text installer, and it seems to want to download the installer
components from a mirror. Because my wifi card is proprietary, I need to use
my external wifi adapter to access the internet. While Trisquel had no
problem detecting it automatically when I used the graphical installer, the
text installer seems to only detect the Intel hardware for eth0 and wlan0.
Even if the Intel ethernet controller would work, I'm not set up for ethernet
right now so I'd prefer to use wifi if internet access is required at all.
Is there a way to use the text installer without connecting to the internet?
It did not appear that the graphical installer required internet access, and
I was under the impression that the installer components were on the USB
drive. I'm new to this, so I likely misunderstand many things.