>>106394889
Here you go, anon. Kubuntu live CD, no changes made.
Commands:
$ sysctl kernel.apparmor_restrict_unprivileged_userns
$ sudo sysctl -w kernel.apparmor_restrict_unprivileged_userns=0
$ systemd-run --user --pty --property=PrivateNetwork=yes ping -c3 1.1.1.1
$ unshare -rn ping 1.1.1.1