As I understand it, Ubuntu uses lots of free (FOSS/FLOSS) software but often also some closed-source proprietary software, which is why Ubuntu is not included in the FSF list of Free GNU/Linux distributions.
While I'm not a fanatic about this, I do want to support the free software movement and use as much free software as possible. So I wonder: is there some way to get a list or overview of all non-free software and firmware that is used/installed on my Ubuntu system?
As you know Aptitude (apt) is a package manager used in Ubuntu . So one can check all installed software and packages with Aptitude.
apt list --installed
You can also check with Debian Package Manager(dpkg) with the following command:
dpkg -l
all these commands don't need root/sudo access.