Lenovo Thinkcentre computers are a reasonable brand / specification. It should comfortably run Linux. Here is a guide to creating a Bootable USB stick - click here Personally I use cd / dvd as you can just drag and drop the iso file onto a cd / dvd and it is bootable. To boot from USB (or cd /dvd) watch screen carefully and there may be a message PressF12 for boot options, or similar. This will boot one time from USB or cd. Alternatively go into the BIOS and look for boot options, set the order - Removable device, cd/dvd, Hard drive.
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