Offer to install VirtualBox and Vagrant if they are not installed

[citbr]

Your script prompts the user to install VirtualBox and Vagrant if they are not installed, but the target audience of your articles may not know how to do that. So your script should either offer to install those programs, or if it's not possible to do that for some reason, offer some help information (either in the script itself or by providing a link to an article that explains it) on how to install that software on a Raspberry Pi running Raspbian Buster. I read your article at https://ownyourbits.com/2019/09/09/nextcloudpi-vm-on-virtualbox-easy-setup-and-clone/ and it seemed to have such detailed instructions except that it completely glossed over these steps. In my case I have only a passing familiarity with VirtualBox (don't even have it installed on any of my current systems) and no idea what Vagrant is, and I would have assumed that if those are essential pieces of software for this project that your script would offer to install them, or offer some assistance in getting them installed! So you might want to consider modifying your script to do that, and also editing your articles to include links to installation instructions that are targeted at Raspberry Pi users.

[FaniD]

Thank you for reading the article and providing this note!

When I was writing the script I could not find a generic way to install these packages on any OS, that's why I decided to prompt the user to do it. However, it's a really good idea to give some help information on how to do this - until I find a generic solution to automate this.
I'll fix it as soon as I can.

Thanks :)

[FaniD]

Temporary fix with instructions for the package manager detected in user's system: #2
Let's leave this issue open until there is a solution for an automatic installation of the packages.