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That AskUbuntu question does not describe a scenario that is "slower". 0% progress and 100% packet loss is no IP connectivity, not "slower".

My Kubuntu desktop has IPv6, and I have no problems running apt.

I just updated from 2001:878:346::116 / mirrors.dotsrc.org; no problems.

Which mirror were you using, and did you file a report?

I used default mirrors and I didn't file a report because I'm not sure where and which part of the system is to blame. All IPv6 traffic was slow. This question is from 2 years ago so I assumed it's a known issue.

Was all IPv6 traffic slower or just this one apparently misconfigured host?

If the former I'd image this is a kernel bug and has nothing to do with any Ubuntu servers.

It honestly doesn't matter what bug it is. It should be promptly investigated further and solved. Random blame assignment doesn't help anyone. In this case though, seeing how most mirrors still can't do HTTPS I would not be surprised if the IPv6 issue is caused by the mirrors - another thing not yet properly configured.

All IPv6 traffic. Checking out from bitbucket took 6 minutes instead of 10 seconds.