Docker does not work behind proxy

try this,

$ sudo vim /etc/resolv.conf

#add these lines on top and above one for home router…
nameserver 8.8.8.8
nameserver 8.8.4.4

After saving the /etc/resolv.conf file.

run $ sudo systemctl daemon-reload for reloading daemon process.

Then restart your docker :

run $ sudo systemctl restart docker