docs(troubleshooting): modern linux sandboxing

Add a note about enabling `kernel.unprivileged_userns_clone` to support modern sandboxing on linux.
puppeteer · Nov 12, 2018 · 10a4c8c · 10a4c8c
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commit 10a4c8c
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diff --git a/docs/troubleshooting.md b/docs/troubleshooting.md
@@ -49,6 +49,10 @@ lsb-release
 xdg-utils
 wget
 ```
+Also enable `kernel.unprivileged_userns_clone` for server `sysctl`. See [comment](https://github.com/GoogleChrome/puppeteer/issues/290#issuecomment-403876758)
+```bash
+sudo sysctl -w kernel.unprivileged_userns_clone=1
+```
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