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My vote is Debian with the Cinnamon desktop. Enable Flatpak and your friend should be good to go.
My vote is Debian with the Cinnamon desktop. Enable Flatpak and your friend should be good to go.
Ubuntu or Mint are among the most noob-friendly.
But probably the biggest impact will be whether you go with Gnome or KDE. KDE is more Windows-like so could be a softer landing.
I've read a lot of stories where installing Linux resulted in less support calls, not more. It depends on how ambitious the user is - if they're mostly just staying in their lane and browsing the web it should be rock solid.