How to check the changelog of a package on Linux

Question: When I install or upgrade a package on Linux, I want to find out what changes (e.g., new features or bug fixes) have been made in the package before or after installing it. How can I view the changelog of a (Deb/RPM) package on [Debian, Ubuntu, CentOS, Fedora]? When a program or a library […]
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How to install non-free packages on Debian

Question: I need to install some proprietary device driver on Debian, which is part of a non-free package. However, I cannot find and install the package in my Debian box. How can I install non-free packages on Debian? The Debian project is distributed as a collection of packages, 48,000 of them, as of Debian Wheezy. […]
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How to find and remove obsolete PPA repositories on Ubuntu

Question: I was trying to re-synchronize package index files by running apt-get update. But I am getting the following “404 Not Found” errors. Looks like I cannot fetch the latest index from some third-party PPA repositories that I’ve added before. How can I clean up such broken and old PPA repositories? Err http://ppa.launchpad.net trusty/main amd64 […]
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How to disable APT cache in Debian or Ubuntu

Question: I do not want to keep downloaded .deb package files after installing them with apt-get or aptitude. How can I disable APT cache to save disk space on my Linux? When you install a package with apt-get or aptitude on a Debian-based system, the downloaded package is, by default, kept in the APT cache […]
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