For those sticking with Ubuntu on the Teres, here is a simple way to ensure all your installed software is free (as in freedom). Note Teres is free by default.
vrms is a painless way to check your system. List info for the vrms package with:
sudo apt-cache show vrms
As you can see this package is a "virtual Richard Stallman" who checks Ubuntu or Debian for non-free software. Someone can correct me if vrms is available on Gentoo or others.
If that sounds useful, then:
sudo apt install vrms
Simply run with:
vrms
or maybe vrms -e
and check out the man page.
Also you can check in the System drop down menu > Preferences > Hardware > Additional Drivers
The bottom of that window should tell you if any proprietary drivers are installed.
Finally you can also use dpkg:
dpkg-query -W -f='${Section}\t${Package}\n' | grep ^non-free
That dpkg command should terminate with no output if there are no non-free packages found.
vrms is lightweight enough that the truly cautious could run a check at every terminal startup by adding it to .bashrc Hope that's useful!
Nice. There is a gentoo version too,
https://github.com/z411/vrms-gentoo
$ perl vrms-gentoo
Calculating...
Non-free packages in teres
dev-texlive/texlive-latexextra-2017 (public-domai)
media-fonts/font-bh-ttf-1.0.3-r1 (bh-luxi)
media-fonts/font-bh-type1-1.0.3-r1 (bh-luxi)
Possibly non-free packages in teres
app-text/yelp-tools-3.18.0 (freedist)
media-libs/glm-0.9.8.5-r1 (HappyBunny)
3 non-free packages, 0.3% of 924 installed packages.
2 possibly non-free packages, 0.2% of 924 installed packages.
Good deal!