Problem with IPv6 sudo apt-get update/upgrade
We can force to update Ubuntu using ipv4 apt-get -o Acquire::ForceIPv4=true update apt-get -o Acquire::ForceIPv4=true upgrade
We can force to update Ubuntu using ipv4 apt-get -o Acquire::ForceIPv4=true update apt-get -o Acquire::ForceIPv4=true upgrade