I'm trying to clean up my system, which is several years old and has gone through several update packs. Currently, Upgrade Manager says I'm up to date with UP8.
While working in synaptic, removing some never-used and obsolete packages, I noticed that I have 1616 packages listed under Installed (manual). That makes no sense, as I don't generally install anything without the software managers, and none of my other debian-family OS's have any entries in this category.
Any suggestions as to what I should do about this (if anything)? I like things to be clean and well ordered.