First, an introduction. I just found a development server with all kinds of GUI packages installed. I'd like to know why. Therefore, I'd like to know which software has been installed that requires X.
I can answer this by answering two closely related questions:
- How can I list all installed packages that no other package depends on?
- How can I list all installed packages that no other package depends on, and that, directly or indirectly, depend on a given package? (E.g.,
For the first question,
apt-mark showmanual is a useful approximation, but it may not be exactly right.
For the second question, what I'm using now postprocesses the
apt-rdepends output to list only results for which no dependencies are listed that are listed as results.
Is this correct? Is there an easier way? I notice the result contains quite a few packages that aren't marked as manually installed.
I need this on Ubuntu 14.04, 16.04, and 18.04.