Honestly, alpine is a great distro, but not really something I would recommend for a beginner. There is less documentation and troubleshooting guides out there tailored to this distro than for example debian or ubuntu.

I would either recommend using Debian or a derivative of that if they want to get their toes wet. Alternatively a complete solution with GUI tools for if they just want to start using their own stuff now.

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%0.2 of 50 is 0.1 you are talking about %20.

Honestly I thought you were going to bitch about them separating your metadata from the photos and you then having to remerge them with a special tool to get them to work with any other program.