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  • The problem is that the CPU is started (by the kernel) in 32-bit mode, so it looks like an old 32-bit machine. 64-bit registers and instructions are not available. Commented Dec 11, 2017 at 15:31
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    Right, which is why you’d need a 64-bit kernel (which Thomas mentioned). Commented Dec 11, 2017 at 15:32
  • Thanks for the nice explanation. So the solution for me would be to install another OS on my RPI3? Commented Dec 11, 2017 at 15:38
  • I just updated my answer. Commented Dec 11, 2017 at 15:47
  • @Thomas, some distros do support combined 32-/64-bit operation, starting with the 32-bit variant. Debian is one example, at least on x86: you can install the i386 variant, and that includes a 64-bit kernel, which allows 64-bit libraries and binaries to be installed too. The ARM support in Debian doesn’t allow this on ARM systems though (but you can install combined arm64 and armhf, if you start with arm64). Commented Dec 11, 2017 at 15:59