Used Macs BTW are excellent bed for Ubuntu, solid hardware and modern (free) software. One can try if it wil run from usb and then if you like it, keep it :-)
I wouldn't bother with an old Intel Mac. They're not particularly well spec'd for the price. Used XPS or Thinkpad of the same era would be a better bang for the buck.
The current M series Macs blow them out of the water but have very shaky Linux support, though I expect current efforts to continue improving.
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