Number of retries to perform. If this is non-zero apt will retry failed
files the given number of times.
+dit(bf(Acquire::Source-Symlinks))
+Use symlinks for source archives. If set to true then source archives will
+be symlinked when possible instead of copying. True is the default
+
dit(bf(http))
HTTP URIs; http::Proxy is the default http proxy to use. It is in the standard
form of em(http://[[user][:pass]@]host[:port]/). Per host proxies can also