How to find the installed packages in your Ubuntu machine?

Before moving further, go through Understanding the state of a package. If the state of a package is “ii, the package is installed. With this logic, we can find the installed packages in the system

$ dpkg --list| grep "^ii"
ii  acpi-support                                            0.136                                           scripts for handling many ACPI events
ii  acpid                                                   1.0.10-5ubuntu2                                 Advanced Configuration and Power Interface e
ii  adduser                                                 3.112ubuntu1                                    add and remove users and groups
ii  adium-theme-ubuntu                                      0.1-0ubuntu1                                    Adium message style for Ubuntu
ii  aisleriot                                               1:2.30.0-0ubuntu6                               Solitaire card games
ii  akonadi-server                                          1.3.1-0ubuntu3                                  Akonadi PIM storage service
ii  akregator                                               4:4.4.2-0ubuntu5                                RSS feed aggregator for KDE
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