Force apt-get to IPv4

Sometimes a remote host or your ISP is temporarily misconfigured with regard to IPv6. In this case, apt-get update or apt update simply hang, for example at

Connecting to mirrordirector.raspbian.org (2a00:1098:0:80:1000:75:0:3) Connecting to archive.raspberrypi.org (2a00:1098:0:80:1000:13:0:5)

You can temporarily force apt to use IPv4:

apt -o Acquire::ForceIPv4=true update

apt -o Acquire::ForceIPv4=true upgrade

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