I just ran into the same issue on a 16.04 system in a IPv6-only network.
My network configuration looks like this:
auto eno1
iface eno1 inet6 dhcp
The fix posted by Graham works for me. After modifying that line I succesfully
get DHCPv6 after a clean reboot.
** Changed in: ifupdown (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1543352
Title:
inet6 dhcp doesn't wait for link-local address to leave tentative -
dhclient fails to bind
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