I ran into the same problem with 17.10 and I solved it without any fixed
or workarounds. But this is not an ubuntu bug! It's a false
configuration. There are 2 Options for automatic IPv6 configuration in
network manager. "Automatic" and "Automatic (DHCP only)". IPv6 router
advertisment is not part of dhcpv6 by spec! So I switch my config to
"Automatic" which uses dhcpv6 and router advertisment. The kernel option
/proc/sys/net/ipv6/conf/ethX/accept_ra is set to 1 (active) then!
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dhcp IPv6 sets accept_ra to 0 and doesn't get IPv6 route
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