[LINUX] Add new APT repository

Adding a new APT repository to a Debian-based distro can be done running the following two commands:

~$ wget -O - <url_key> | sudo apt-key add -
~$ sudo wget -O /etc/apt/sources.list.d/<source>.list <url_source_list>

<url_key> is the URL of the key
<source> is the name of the source
<url_source_list> is the URL of the remote source list file

The first command downloads the corresponding APT key, while the second one adds the repository into a new source list file.

Now you can update APT executing the usual command:

~$ sudo apt-get update

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