+
+ <varlistentry><term>update</term>
+ <listitem>
+ <para>
+
+ Update the local keyring with the keyring of Debian archive
+ keys and removes from the keyring the archive keys which are no
+ longer valid.
+
+ </para>
+
+ </listitem>
+ </varlistentry>
+ </variablelist>
+</refsect1>
+
+ <refsect1><title>Files</title>
+ <variablelist>
+ <varlistentry><term><filename>/etc/apt/trusted.gpg</filename></term>
+ <listitem><para>Keyring of local trusted keys, new keys will be added here.</para></listitem>
+ </varlistentry>
+
+ <varlistentry><term><filename>/etc/apt/trustdb.gpg</filename></term>
+ <listitem><para>Local trust database of archive keys.</para></listitem>
+ </varlistentry>
+
+ <varlistentry><term><filename>/usr/share/keyrings/debian-archive-keyring.gpg</filename></term>
+ <listitem><para>Keyring of Debian archive trusted keys.</para></listitem>
+ </varlistentry>
+
+ <varlistentry><term><filename>/usr/share/keyrings/debian-archive-removed-keys.gpg</filename></term>
+ <listitem><para>Keyring of Debian archive removed trusted keys.</para></listitem>
+ </varlistentry>
+
+
+