ifupdown works sequentially, so in this case you're asking it to
configure an ipv6 address on an interface you haven't defined yet.
Move the "iface br0 inet6 auto" after the "iface br0 inet static"
section, that should fix it.
Also, I don't think you actually need that line at all as the kernel's
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https://bugs.launchpad.net/bugs/1021398
Title:
ifup bridge devices does not work with inet6
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