Force apt-get to use IPv4 or IPv6

black3dynamite

Non-Persistent Option

# Force apt-get to use IPv4
apt-get -o Acquire::ForceIPv4=true update

# Force apt-get to use IPv6
apt-get -o Acquire::ForceIPv6=true update

Persistent Option

# /etc/apt/apt.conf.d/99force-IPv4or6
sudo tee /etc/apt/apt.conf.d/99force-IPv4or6 <<EOF
Acquire::ForceIPv4 "true";
EOF

# If you are using the persistent option, you can switch between IPv4 or IPv6 by changing 4 and 6

# This is how you change them using sed
# IPv4 to IPv6
sudo sed -i 's/ForceIPv4/ForceIPv6/' /etc/apt/apt.conf.d/99force-ipv4or6

# IPv6 to IPv4
sudo sed -i 's/ForceIPv6/ForceIPv4/' /etc/apt/apt.conf.d/99force-ipv4or6

# To confirm the changes
cat /etc/apt/apt.conf.d/99force-ipv4or6

Sources:
https://www.vultr.com/docs/force-apt-get-to-ipv4-or-ipv6-on-ubuntu-or-debian
https://askubuntu.com/a/20416