I have tried to install Ubuntu Studio both 32 and 64 versions on an old XP System several times. The installation always stopped with errors. With the 64 version I got the error message: "requires an x86-64 CPU; detected an i686 CPU; unable to boot". Does it mean there is a general Problem with the i686 CPU? Or can I download another version to support i686 CPU? Thanks, Peter
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i686 is a grade of x86 (32-bit) processor, so you cannot use a x86_64 or amd64 ISO/OS.
I get this issue on pentium M, pentium IV/4 machines as they are 32-bit only, but I try and boot a amd64 ISO/OS.
FYI: Some very early pentium M are i586 grade, ie. less capable than later model processors These won't run any modern Ubuntu ISO (but can run Debian).
Most XP machines were amd64/x86_64 capable, but lower-end (esp. older) consumer grade often were x86 only; and NOTE Debian & Ubuntu refer to all x86 ISOs as i386 grade on ISOs, so look for i386 on download (even if the code within is i586/i686 today)
Your issue is you downloaded the amd64 (64-bit x86) ISO (it's named AMD64 as AMD created the compatible x86_64, intel's IA64 was incompatible & failed in the marketplace; so even if you're using an cpu you use amd64 too).
Ubuntu Studio 18.04 was not a LTS or long-term-support release, though you can add an PPA to get extended support, but you didn't provide release details. All recent 20.04 releases were amd64 (no i386 ISOs were produced after 19.04)
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