There is a bug report from 2018 that netplan has no support for prefix delegation requests. It's still not fixed.

PS: To whomever decided that it was a good idea to write netplan and then make it the default: why bother if you are not going to support IPv6 properly?

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    Tempting though it may be to post here, bugs and discussion of them have their place elsewhere. Please see help.ubuntu.com/community/ReportingBugs and then visit answers.launchpad.net/ubuntu/… – K7AAY Mar 26 at 23:34
  • Rants don't go over too well here. If you have a valid question, feel free to ask it. – heynnema Mar 27 at 0:34
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    Canonical has ignored the problem, @K7AAY. The bug is that new, deficient software gets written, replacing working stuff without feature parity. – JayEye Mar 27 at 1:20
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    @heynnema I already asked the valid question: why is new stuff being deployed as the default when it's missing features supported before. – JayEye Mar 27 at 1:20
  • What did you use before that's not working now? – muru Mar 27 at 2:25

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