Ubuntu actually has a lot of privacy issues and non-FOSS components, including telemetry and the snap store (whose back end is proprietary). Simply searching up these issues will give you plenty of reading material if you want to learn more.

Debian is amazing, if you’re okay with having older versions of software since the flagship stable version updates packages pretty infrequently (security updates generally are pushed fairly quickly through backports though). It might be just what you’re looking for, it might not, it depends on what your preferences are.

I’m currently using Fedora as my daily driver as I find that it has a good balance between stability and package update frequency. I also liked openSUSE Tumbleweed (a rolling release distro), but I found that packages associated with my Nvidia graphics card broke it on a semi regular basis, so your mileage may vary. openSUSE Leap is the standard release version, whose packages don’t updates as often as Fedora, but is a good choice for stability and reliability. I would consider both Fedora and openSUSE to be reasonably easy for someone new to Linux to use.

Last comes the elephant in the room, Arch Linux. Honestly, not many Linux users would recommend Arch to someone just starting out with Linux as it is kind of difficult and does break often due to its rolling release model. You could try Manjaro, but it also had issues with using non-FOSS software (not sure if it still does), see my other comment, and again, you’re going to have to figure out how to fix the system if arch updates break it.