Update apt index
apt-get update
Extract package into directory
dpkg-deb -x mypackage.deb dstDir
Find installed packages
dpkg -l <pkg>
Install specific package + version
apt-get install pkg=version
View package contents
dpkg-deb -c <pkg>
Install local package
apt install ./path
Apt cache directory
ls -l /var/cache/apt/archives/
Clean cache directory
apt-get clean