Dear wide-dhcpv6 user and bug-reporter, Sorry for the late response regarding to your report! I recently adopted wide-dhcpv6 package in Debian and I'm checking the bug list. I find you report on failure upgrade/install: https://bugs.debian.org/725702
The bug somewhat is like https://bugs.debian.org/773878, which is already fixed in latest release in sid (wide-dhcpv6/20080615-15) But I'm not 100% sure about it so I write to you for help. Could you confirm the issue is resolved by 20080615-15? FYI. 20080615-15 is just uploaded to sid, so I guess it will be in testing (stretch) from Dec. 22. Thanks for help in advance! Cheers, Roger