[Ubuntu installation] replace apt-get with apt

[kevinadhiguna]

Proposed changes

I replaced apt-get with apt as it is the one that Linux distributions recommend. It gives you the tools you need to manage your packages. Most importantly, with fewer but easy-to-remember options, it is simpler to use.

In addition, what I replaced are commands that install and remove packages :

- sudo apt-get install
+ sudo apt install

- sudo apt-get remove
+ sudo apt remove

- sudo apt-get purge
+ sudo apt purge

Any feedback will be appreciated, thanks!

References :

• Difference Between apt and apt-get Explained - It's Foss
• What is the difference between apt and apt-get? - Ask Ubuntu

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[crydotsnake]

@usha-mandya

[thaJeztah]

Thank you for contributing!

We use apt-get instead of apt in these instructions so that the example commands can be used by users who want to script these steps. While apt is intended for "interactive" use, apt-get is still the recommended tool for scripting (as it has a stable API, whereas apt does not).

Some earlier discussions on this can be found in #10547, #8135, and probably some other ones.

I'm closing this PR because of the above, but thanks again for contributing, and feel free to continue the conversation.