Issue

The helpers install_packages, uninstall_packages, and is_package_installed have multiple issues:

• The literal ('ubuntu') is not a tuple but a string with superfluous parenthesis. A tuple requires at least one comma. It's a common gotcha in Python. Therefore it is recommended to use set literals like {'ubuntu'} for item in items checks.
• The functions only check for ubuntu but not for debian platform although only ipaplatform.debian exists and 'debian' is an ID_LIKE for ubuntu.
• shlex is not necessary and should be avoided, too.