Can't access internet

[apaj]

A container created using this Dockerfile can't access internet:

root@cf81115deee8:~# ping google.com
bash: ping: command not found
root@cf81115deee8:~# apt-get install ping
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package ping

whereas other docker containers I have on the same physical machine successfully use apt-get.
Is there anything else one should do to get online from within this container?

[ritvik-maker]

idk bruh

[sajjadahmed0309]

@apaj
https://help.ubuntu.com/stable/ubuntu-help/net-wireless-connect.html.en