The installer bug task seems to be fixed. I cannot reproduce this with recent versions of netplan (it accepts quoted and unquoted IPv6 addresses).
Please re-open if this is still an issue. ** Changed in: nplan (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1751151 Title: Installing via IPv6 results in invalid netplan yaml To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/netcfg/+bug/1751151/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs