added Troubleshooting section to README.md, and addressed binfmt_misc issues
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README.md
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README.md
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@ -249,3 +249,26 @@ follows:
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* Once you're happy with the image you can remove the SKIP_IMAGES files and
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export your image to test
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# Troubleshooting
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## `binfmt_misc`
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Linux is able execute binaries from other architectures, meaning that it should be
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possible to make use of `pi-gen` on an x86_64 system, even though it will be running
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ARM binaries. This requires support from the [`binfmt_misc`](https://en.wikipedia.org/wiki/Binfmt_misc)
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kernel module.
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You may see the following error:
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```
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update-binfmts: warning: Couldn't load the binfmt_misc module.
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```
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To resolve this, ensure that the following files are available (install them if necessary):
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```
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/lib/modules/$(uname -r)/kernel/fs/binfmt_misc.ko
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/usr/bin/qemu-arm-static
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```
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You may also need to load the module by hand - run `modprobe binfmt_misc`.
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