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Just so, is Debian hard to use?

Three Reasons Not to Use Debian In Debian, getting non-free software is as easy as adding the repositories. However, for some users, even that is too much effort. They prefer a Debian derivative like Linux Mint or Ubuntu that makes getting non-free drivers or tools like Flash even easier.

is Debian a beginner? Debian is a good option if you want a stable environment, but Ubuntu is more up-to-date and desktop-focused. Arch Linux forces you to get your hands dirty, and it's a good Linux distribution to try if you really want to learn how everything works… because you have to configure everything yourself.

Then, why does Debian take so long to install?

To install Debian from a "net-install" ISO requires some time because the software is downloaded from the Debian servers during the process: the time duration needed for the installation then depends on the speed and quality of your Internet connexion and may vary from 40 up to 90 minutes.

Should I install Debian or Ubuntu?

Generally, Ubuntu is considered a better choice for beginners, and Debian a better choice for experts. Granted, you can still install non-free software on Debian, but it will not be as easy to do as it is on Ubuntu. Given their release cycles, Debian is considered as a more stable distro compared to Ubuntu.