>> How much space does a Linux Mint installation take? 20GB?
System requirements:
1GB RAM (2GB recommended for a comfortable usage).
15GB of disk space (20GB recommended).
1024×768 resolution (on lower resolutions, press ALT to drag windows with the mouse if they don’t fit in the screen).
Nothing wrong with Mint, but I am a big MX-16 fan as a replacement for windows os.
A little more hardcore is Manjaro.