running “apt install fping” gives me both fping & fping6 on my ubuntu installs
root@ubuntu:~# ls -la /usr/bin/fping*
-rwxr-xr-x 1 root root 39232 Jan 12 2017 /usr/bin/fping
-rwxr-xr-x 1 root root 39232 Jan 12 2017 /usr/bin/fping6
root@ubuntu:~# getcap /usr/bin/fping*
/usr/bin/fping = cap_net_raw+ep
/usr/bin/fping6 = cap_net_raw+ep
maybe use try a “apt-get update && apt remove fping && apt install fping” and check for error messages on install. my container-based installs all say they can’t run the “setcap” commands, but it still installs the binaries.