Whenever an installation is interrupted, you may get this message e.g. I just issued

apt-get remove gaim

and then realized that it was also uninstalling ubuntu-desktop which is a meta package, so I pressed Ctrl + C (while it was still “Reading the database”). A couple of hours later, when I tried to run Adept Installer, it snapped back with the error above. The solution is simple, open the terminal and issue:

sudo dpkg –configure -a

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