During the installation process I can check the box 'Install third-party software for graphics and Wi-Fi hardware and additional media formats. […] Some is proprietary.' I think there might be some drivers then that are proprietary. Also, if I install apps manually there might be some that are not open-source. However, which other parts of Ubuntu 20.04 are proprietary by default?
Ubuntu – Which parts of Ubuntu are proprietary
20.04proprietary
Best Answer
The kernel of common linux distributions quite inevitably contain some proprietary binary "blobs" in the kernel for hardware drivers. Without such blobs, hardware support of linux would be much more seriously limited that it is already to some extent.
Apart from that, the presence of proprietary software in most linux distributions is quite limited. Ubuntu does not install proprietary applications by default. However, it offers proprietary software through the Software center or Snap store, and it can offer to install additional proprietary drivers for graphics cards or modems. So you need to inform yourself about the software license before installing additional software if this is a concern.