Apt install size & remove size are different

Let's say I installed mumble server. At the time of installation, it showed X MB of storage will be used (can't remember).

If I uninstall those programs, the size is relatively less than that of installation size.

Why is that so? Do I need to remove its configuration? How can I find app-specific configuration?

Solution 1:

It is normal. This happens because of dependencies.
If you run sudo apt-get autoremove or sudo apt-get autoremove --purge (to remove all configs), you then get expected size.

Next time please read about APT internals first by using docs like

• https://debian-handbook.info/browse/stable/sect.package-meta-information.html#id-1.8.6.8.13
• https://debian-handbook.info/browse/stable/sect.apt-get.html#sect.apt.install
• https://ubuntu.com/server/docs/package-management .

or whole https://debian-handbook.info/download/stable/debian-handbook.pdf .