This is one of those simple things that make life easier. I’m working with OpenHAB on my Raspberry Pi, and their offline package is 160MB. I needed to blow it away this morning and reinstall it, and I didn’t want to burn another 160MB of bandwidth to do so.

Easy solution: .deb packages are cached in /var/cache/apt/archives/, so I was able to purge it and reinstall it with dpkg -i without fetching it again.