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Documentation: Add simple troubleshooting guide

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In this guide, we explain two boot errors that can occur and what can be
done to solve them.
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Liav A 2021-07-07 20:50:32 +03:00 • committed by Gunnar Beutner
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# Troubleshooting
In case of an error, you might find an answer of how to deal it here.
## I build everything, the VM starts and then I see...
### "Error: Kernel Image too big for memory slot. Halting!"
This means the kernel is too large again. Contact us on the discord server or open a GitHub Issue about it.
You might want to revert latest changes in tree to see if that solves the problem temporarily.
### "Your computer does not support long mode (64-bit mode). Halting!"
Either your machine (if you try to boot on bare metal) is very old, thus it's not supporting x86_64 extensions, or you try to use VirtualBox without using a x64 virtualization mode or you try to use `qemu-system-i386` which doesn't support x86_64 extensions too.