Comment 7 for bug 1936437

Some more info on this bug:

 * In >=Focal ping6 is a symlink to ping, so ping may fail
   in the same way.

 * ping gets the "raw socket" permissions it needs via a
   capability:

   $ getcap /usr/bin/ping
   /usr/bin/ping cap_net_raw=ep

   No need for suid bits.

 * I downloaded ubuntu-20.04-server-cloudimg-armhf.img from [1],
   mounted it with using qemu-nbd and verified that ping has the
   right capability: it does. However I'm not 100% sure that's
   the image used to deploy the autopkgtest testbed systems.

 * ping doesn't even need that one, provided that the GID
   running ping is in this range:

   sysctl net.ipv4.ping_group_range
   net.ipv4.ping_group_range = 0 2147483647

   Note: this also affects IPv6.

[1] https://cloud-images.ubuntu.com/releases/focal/release/