This Short Tip Show How to Check If a Package is Already Installed in Ubuntu Linux.
To the Article Bottom Link to Post Showing Exactly Howto Search for Files/Directories/Paths/Images by Command Line.
The Contents and Details are Expressly Essentials to Give Focus Only to the Essentials Instructions and Commands and Make Tip Easier to Read & Understand ;)
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Open a Terminal Window
(Press “Enter” to Execute Commands) - Copy
dpkg -l [packagename]
For Example here Below the Output of a Check for python-django.
Here To Get some Extra-Insight Look this other Guide:
HOW to Find Files/Directories/Images on Linux Command Line
How to Search Files, Icons, Images or PATHS with the LocateCommand