I want to be able to view packages that I have installed. I don't want it to be EVERY package on my computer but just the ones I got from ubuntu Software Center and sudo apt-get install.
3 Answers
From the Ubuntu Software Center :
Go to the Installed Tab:

You can also view all the software that you installed from the software Center by going to the History Tab:
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aptitude way
By using aptitude
you can list packages and see whether they were installed automatically (as a dependency) or manually installed:
aptitude search '~i!~M'
Unfortunately, a lot of base/system packages are installed and marked as manually installed after installation already.
Cons: lists quite some system packages marked as manually installed too.
apt history log
Alternatively, look at the logs APT keeps for 12 months by default in /var/log/apt/history.log (and rotated files). Use grep to filter for lines about installed packages throughout all files:
zgrep ^Install /var/log/apt/history.log*
Cons: removed packages are still listed, only has last 12 months of history by default.
In syslog you can view too - which packages currently have been installed - in dpkg.log is listed of recent month, what has been updated or installed.
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