CODE EXAMPLE FOR SHELL

apt disable ipv6

apt-get -o Acquire::ForceIPv4=true update

#To make the setting persistent, create the file 99force-ipv4 in /etc/apt/apt.conf.d/.
sudo nano /etc/apt/apt.conf.d/99force-ipv4

#Put the following contents in it:
Acquire::ForceIPv4 "true";