How do I get the package to the computer and how to install with apt?
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
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You can also define a local directory as apt source folder: https://askubuntu.com/questions/170348/how-to-create-a-local-apt-repository