Find all Deb packages currently installed

The following is a very useful command, esp before doing an upgrade:

dpkg --get-selections "*"

The following is a brief summary of the listing:

xserver-xorg-video-cirrus                       install
xserver-xorg-video-fbdev                        install
xserver-xorg-video-geode                        install
xserver-xorg-video-i128                         install
xserver-xorg-video-i740                         install
xserver-xorg-video-intel                        install
xserver-xorg-video-mach64                       install
xserver-xorg-video-mga                          install
xserver-xorg-video-neomagic                     install
xserver-xorg-video-nouveau                      install
xserver-xorg-video-nv                           install
xserver-xorg-video-openchrome                   install
xserver-xorg-video-r128                         install
xserver-xorg-video-radeon                       install
xserver-xorg-video-rendition                    install
xserver-xorg-video-s3                           install
xserver-xorg-video-s3virge                      install
xserver-xorg-video-savage                       install
xserver-xorg-video-siliconmotion                install
xserver-xorg-video-sis                          install
xserver-xorg-video-sisusb                       install
xserver-xorg-video-tdfx                         install
xserver-xorg-video-trident                      install
xserver-xorg-video-tseng                        install
xserver-xorg-video-vesa                         install
xserver-xorg-video-vmware                       install
xserver-xorg-video-voodoo                       install
xsltproc                                        install
xterm                                           install
xtrans-dev                                      install
xulrunner-1.9.1                                 deinstall
xxdiff                                          install
xz-utils                                        install
yelp                                            install
zip                                             install
zlib1g                                          install
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