Add limited support for debian-based distros

[CloneMMDDCVII]

I'm wondering whether limited support (no PPAs for example) could be enabled for non-Ubuntu but still Debian based distros. Trying out LMDE5, and I'm already sad I can't use my newly found favourite piece of software.

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[natanjunges]

I think this can be closed as completed now.

[flexiondotorg]

This has been implemented.