Default NetworkManager Security Configuration for IPv6 Causes Severe Hang

[OmniUni]

After upgrading to 24.04 on my laptop, I noticed my boot was taking about 2 minutes. After a lot of troubleshooting, I determined that when I add a network connection through KDE, it has the IPv6 security set to default. The default behavior is to apply IPv6 privacy settings. Running NetPlan debug, this step takes around two minutes.

Setting the wireless connection configuration IPv6 privacy to "disabled", my wireless connects instantly and my computer no longer hangs for two minutes when booting.

When adding new wireless connections, however, the Plasma desktop also freezes for about two minutes during this step until I can edit the connection and disable the "default" privacy feature.

I'm not sure if this is due to a problem in KDE (should this setting be disabled by default?) or in NetworkManager (should the "default" configuration have this disabled?), in NetPlan (should it have something in the default network configuration for all connections that set `stable-privacy` (which seems to be the "disabled" option)?

Regardless, this process taking nearly two minutes, adding that to the boot time, seems unacceptable.

[OmniUni (omniuni)]

Running `sudo netplan --debug generate`, the process hangs on:

    NetworkManager: default override: clearing ipv6.ip6-privacy

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Libera.chat.

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