You can search for a certain package in a Debian system using dpkg.
dpkg --list "package_name"
Example
Give the command
dpkg --list "apache2*"
the result looks like:
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 Architecture Description
+++-==========================-==================-==================-==========================================================
ii apache2 2.2.22-13 amd64 Apache HTTP Server metapackage
un apache2-common <none> (no description available)
un apache2-doc <none> (no description available)
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 2.2.22-13 amd64 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 2.2.22-13 amd64 utility programs for webservers
ii apache2.2-bin 2.2.22-13 amd64 Apache HTTP Server common binary files
ii apache2.2-common 2.2.22-13 amd64 Apache HTTP Server common files
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