root@server11:~# dpkg -l 'apache*'
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                      Version                   Description
+++-=========================-=========================-==================================================================
un  apache                    <none>                    (no description available)
un  apache-common             <none>                    (no description available)
un  apache-utils              <none>                    (no description available)
ii  apache2                   2.2.16-6+squeeze1         Apache HTTP Server metapackage
un  apache2-common            <none>                    (no description available)
ii  apache2-doc               2.2.16-6+squeeze1         Apache HTTP Server documentation
un  apache2-mpm               <none>                    (no description available)
un  apache2-mpm-event         <none>                    (no description available)
un  apache2-mpm-itk           <none>                    (no description available)
ii  apache2-mpm-prefork       2.2.16-6+squeeze1         Apache HTTP Server - traditional non-threaded model
un  apache2-mpm-worker        <none>                    (no description available)
un  apache2-suexec            <none>                    (no description available)
un  apache2-suexec-custom     <none>                    (no description available)
ii  apache2-utils             2.2.16-6+squeeze1         utility programs for webservers
ii  apache2.2-bin             2.2.16-6+squeeze1         Apache HTTP Server common binary files
ii  apache2.2-common          2.2.16-6+squeeze1         Apache HTTP Server common files