Yeah, a sff mini pc draws below 10 W on idle, so the math is about right, even if a gaming PC can also draw as low as 40 Watt on idle if you buy a reasonably powered gpu.

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I would think it moral to download the discs you own as rips. Get a vpn for a month and download away. This would be a lot less time and electrical energy consuming compared to ripping them yourself. Also somebody else has already dealt with drm bullshit.

Roblox can also be installed via lutris on Linux.

Popos also has specific guides for these common errors:

https://support.system76.com/articles/bootloader

When is a door not a door?