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apt HTTP(S) proxy

Ubuntu / Debian · easy · solved in-browser (no VM needed) · 3 tiered hints

Write /etc/apt/apt.conf.d/01proxy directing apt through a caching proxy: set Acquire::http::Proxy and Acquire::https::Proxy both to "http://proxy.example.com:3142". Put each directive on its own line ending in a semicolon. (Authored config, graded structurally — the engine isn't run here.)

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