Diffenerce between apt list and apt ---installed

Running BBB on 32G microSD. I want to install man pages.
When I type apt list --installed | grep manpage, The list is empty
When I type apt list | grep manpage, It shows about 30 packages. For example:

  • erlang-manpages/oldstable 1:23.2.6+dfsg-1+deb11u1 all
  • freebsd-manpages/oldstable 12.2-1 all
  • manpages-de-dev/oldstable 4.10.0-1 all
  • manpages-de/oldstable 4.10.0-1 all
  • manpages-dev/oldstable 5.10-1 all
  • manpages-es-dev/oldstable 4.10.0-1 all
  • manpages-es/oldstable 4.10.0-1 all

Basically, what are these non-installed packages? Are they taking up disk space?

Just use dpkg’s version…

dpkg --list manpages*
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name              Version      Architecture Description
ii  manpages          6.03-2       all          Manual pages about using a GNU/Linux system
un  manpages-de       <none>       <none>       (no description available)
ii  manpages-dev      6.03-2       all          Manual pages about using GNU/Linux for development
un  manpages-fr       <none>       <none>       (no description available)
un  manpages-fr-extra <none>       <none>       (no description available)
un  manpages-pl       <none>       <none>       (no description available)

First 2 letters will tell you what state it is in…


dpkg --list manpages* shows status un. (Not installed)

In general, I am try to understand the difference between an uninstalled package and a installed package. Being new to debian/linux, I do not understand why I would have non-installed packages?

Are non-installed package just a list of packages that are compatible with my system that can be downloaded and installed?


$apt-cache search tools | grep dev

After “search” add what you are looking for with or without wildcard *
Vertical bar is the *nix piping command, this “pipes” the output of that command into grep that further sorts the results and will highlight and display lines with the word “dev”

Think of it both ways… list of Installed and a list of packages you could install.

In the end it’s just a database file with a flag - installed, - not installed



That clears things up.