I'm having a similar issue. I have disabled Route Advertisement
(accept_ra=0) in sysctl.conf file, but at boot I still get a default
IPv6 route to my router with an RA flag, which means it was assigned
using a ra.

The default route expires soon after the boot, as it does not get
renewed. This shows that the accept_ra=0 is actually working. It's not
accepting route advertisements anymore, so this route does not get
renewed. However, why do I still get the first route over RA? It's
bugging my interface, as it has a gateway rule, but is not able to set
it as there is already a default route assigned by a RA. I have no idea
why it's even possible to get a route automatically before the actual
interface is up (it's trying to assign the gateway I put in the
interfaces file, but I get an error: File exists.).

Only solution so far is removing the gateway line, causing the default
route to appear automatically by RA and setting accept_ra to 1.

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https://bugs.launchpad.net/bugs/997605

Title:
  Disabling IPv6 autoconfiguration in sysctl.conf doesn't affect boot
  process

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