CentOS installations might have "apt" as "annotation processing tool"…

[thorleifjacobsen]

Fixes so it checks for apt-get on ubuntu installations. Less chance of collision with other tools named "apt".

Describe your changes

Changed so it checks for command -v apt-get which is commands they use for APT instead of command -v apt which is also a part of java tools apt (1) - annotation processing tool

This makes some linux version think it is APT when it might not is.

Issue ticket number and link

Checklist

• [x] Is it a bug fix
• [ ] Is a typo/documentation fix
• [ ] Is a feature enhancement
• [ ] It is a refactor
• [ ] Created tests that fail without the change (if possible)
• [ ] Extended the README / documentation, if necessary

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