Thank you for your reply, lembas. I that they came from the Brother
HL-4150CDN driver, which requires ia32-libs or lib32stdc++.
I'm not really familiar with this, but I've assumed that the drivers only
work on a 64-bit system unless either of the above transitional packages or
converters is installed.
I have used each of those transitional packages before on Ubuntu and Mint and
I didn't have problems.
I was thinking about this earlier in the day. It seems I could try
- removing ia32-libs (the one I used on Trisquel) as you suggest. In fact,
I'll try that first.
- reinstalling but using the 32-bit version of Trisquel.
- seeing if CUPS will offer me an open-source, 64-bit driver (I didn't even
try that; I simply went to Brother's website for a driver.)
It may a day or two before I have time to continue on this, but I will post
my experiences here. Thank you, lembas.