<listitem><para><literal>upgrade</literal> is used to install the
newest versions of all packages currently installed on the system
from the sources enumerated in
- <filename>/etc/apt/sources.list</filename>. New package will be
- installed, but existing package will never removed.
+ <filename>/etc/apt/sources.list</filename>. New packages will be
+ installed, but existing packages will never be removed.
</para></listitem>
</varlistentry>