This configuration key is listed in /usr/share/doc/apt/examples/configure-index.gz , with all the other configuration keys. If you want to use it, read the manpage for apt.conf and the mentioned configure-index.gz.
This configuration key is listed in /usr/share/ doc/apt/ examples/ configure- index.gz , with all the other configuration keys.
If you want to use it, read the manpage for apt.conf and the mentioned configure-index.gz.