How to find whether a package is installed on Linux Mint?

How to find whether a package is installed on Linux Mint? For example, I would like to check whether ghostscript is installed.

Using dpkg:

dpkg -l

List all available packages (installed and not installed):

apt-cache pkgnames
Answered by Eric Z Ma.

Eric Z Ma

Eric is a father and systems guy. Eric is interested in building high-performance and scalable distributed systems and related technologies. The views or opinions expressed here are solely Eric's own and do not necessarily represent those of any third parties.

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