How to get the video-hybrid-intel-nvidia-390xx-bumblebee working?

[banjo]

…needs still a bit of configuration.

• Bumblebee fails to start after update - "IgnoreABI" ineffective?
• Bumblebee - ArchWiki (add user/enable bumblebeed.service)
• Configure Graphics Cards - Manjaro (Optimus/Bumblebee)