Add warning about containers (#203)
A couple people have come by IRC having issues where the root cause was that they were stuck on the CDDL/GPL prompt from apt never rendering because their container runtime console wasn't being detected as dumb/noninteractive by apt, but wasn't capable of displaying the prompt. So let's add a warning about that, shall we?
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@@ -42,6 +42,10 @@ Install the packages::
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apt install dpkg-dev linux-headers-$(uname -r) linux-image-amd64
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apt install zfs-dkms zfsutils-linux
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**Caution**: If you are in a poorly configured environment (e.g. certain VM or container consoles), when apt attempts to pop up a message on first install, it may fail to notice a real console is unavailable, and instead appear to hang indefinitely. To circumvent this, you can prefix the `apt install` commands with ``DEBIAN_FRONTEND=noninteractive``, like this::
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DEBIAN_FRONTEND=noninteractive apt install zfs-dkms zfsutils-linux
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Root on ZFS
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-----------
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.. toctree::
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