Istalling a new more powerful graphics card.
This is a VERY basic administrative job. They could go to their local PC world and buy the GFX card, come home and then... bam. Into the command line to install the drivers? Multiple reboots? Multiple commands.
It's been made super easy to do in windows, but a ball ache in linux. You can burry your head in the sand and say it isn't so - but this is why someone wouldn't choose the various (and basically confusing number of) linux distros over the not quite finished yet windows 10.