Somebody tipped me off to two useful software tools which display detailed system information. This is especially helpful if you are making a tech support forum post and want to provide detailed information about your system. The first is inxi:
First, you need to run the commands
sudo update-pciids, then
inxi -Fxz to get the interesting information.
The other command is neofetch which gives a condensed description of your desktop environment and some other basic system information:
Neither of these programs are likely to be installed by default on a system, but they are likely to be in your distro’s package repository.