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APT

Debian-family high-level package management toolchain.

APT (Advanced Package Tool) resolves dependencies and orchestrates installation of .deb packages on Debian, Ubuntu, and their derivatives. The apt command-line tool (plus apt-get, apt-cache, and aptitude) wraps the lower-level dpkg tool to fetch packages from configured archives, verify signatures, and compute install orders.

It is the most widely used package manager on Linux by sheer install count, given Ubuntu and Debian's market share.

Ships with Debian, Ubuntu, and derivatives.