Learn how to install Flatpak apps on an offline Linux system without internet. Works on Debian, Ubuntu, Fedora, and all major ...
Linux is compelling because it's free and might work on a PC you already own. But there are so many challenges.
Your dream Linux distro already exists.
If you need to use virtual machines on Linux, try Virt-Manager. Virt-Manager is more reliable than VirtualBox. Virt-Manager is completely free and open-source. I'm a long-time supporter of VirtualBox.