[0x006A]

on https://bugzilla.redhat.com/show_bug.cgi?id=2196105 a comment suggests that it might only be possible if you have "unprivileged user namespaces" enabled

[pizzalife]

>a comment suggests that it might only be possible if you have "unprivileged user namespaces" enabled

Which is the default on Ubuntu.

[chlorion]

It's the default on pretty much any modern Linux system!