SOURCES.LIST(5) APT SOURCES.LIST(5) (NAME) sources.list - APT (DESCRIPTION) /etc/apt/sources.list /etc/apt/sources.list.d/ . ( ) ( deb822) ( ). apt-get update ( APT) . /etc/apt/sources.list ( ) /etc/apt/sources.list.d/ : 00-high-preference.list 50-middle-preference.sources z-low-preference.list . SOURCES.LIST.D /etc/apt/sources.list.d sources.list . . .list .sources . (a-z A-Z) (0-9) (_) (-) (.) . APT Dir::Ignore-Files-Silently - . /etc/apt/sources.list.d/vendor.sources vendor dpkg-vendor --query Vendor | tr A-Z a-z deb822 . /etc/apt/sources.list.d/ubuntu.sources . (ONE-LINE-STYLE FORMAT) .list . ( deb-src) . . # . . ([]) . (,) . (=) () . -= += () () . apt . apt . . 2029. DEB822 (DEB822-STYLE FORMAT) .sources . apt debian/control . # . "Enabled: no" . yes . : (:) () . ( ) . Architectures Architectures-Add Architectures-Remove . 1.1 apt . . . apt APT . . DEB DEB-SRC deb distribution/component. distribution (suite) stable testing (codename) trixie forky component main contrib non-free non-free-firmware . deb-src deb . deb-src . deb deb-src : deb [ option1=value1 option2=value2 ] uri suite [component1] [component2] [...] deb-src [ option1=value1 option2=value2 ] uri suite [component1] [component2] [...] deb822 : Types: deb deb-src URIs: uri Suites: suite Components: [component1] [component2] [...] option1: value1 option2: value2 URI deb APT . suite (components) suite (/) . URI . suite component . suite $(ARCH) ( amd64 armel) . sources.list . APT URI . URI . APT URI . APT . . ( CD-ROM ). : deb [signed-by=/usr/share/keyrings/debian-archive-keyring.gpg] http://deb.debian.org/debian trixie main contrib non-free non-free-firmware deb [signed-by=/usr/share/keyrings/debian-archive-keyring.gpg] http://deb.debian.org/debian trixie-updates main contrib non-free non-free-firmware deb [signed-by=/usr/share/keyrings/debian-archive-keyring.gpg] http://deb.debian.org/debian-security trixie-security main contrib non-free non-free-firmware deb822 : Types: deb URIs: http://deb.debian.org/debian Suites: trixie trixie-updates Components: main contrib non-free non-free-firmware Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg Types: deb URIs: http://deb.debian.org/debian-security Suites: trixie-security Components: main contrib non-free non-free-firmware Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg DEB DEB-SRC (THE DEB AND DEB-SRC TYPES: OPTIONS) . deb822 . deb822 . . APT . o Include (include) . . o Exclude (exclude) . . Include . o Architectures (arch) . APT::Architectures . o Languages (lang) . Acquire::Languages . o Targets (target) apt . Acquire::IndexTargets ( Created-By ). Identifier . o PDiffs (pdiffs) yes/no APT PDiff . PDiff . Acquire::IndexTargets Acquire::PDiffs yes . o By-Hash (by-hash) yes no force APT URI (hashsum) . . yes no / force . Acquire::IndexTargets Acquire::By-Hash yes . URI Suite . APT . o Allow-Insecure (allow-insecure) Allow-Weak (allow-weak) Allow-Downgrade-To-Insecure (allow-downgrade-to-insecure) no . yes apt-secure(8) ! o Trusted (trusted) APT . . yes APT . apt-secure(8) ( ) . no . . o Signed-By (signed-by) apt-secure(8) apt . (keyring) ( _apt ) . /usr/share/keyrings /etc/apt/keyrings . trusted.gpg trusted.gpg.d/ . . (!) . Release ( ). . GPG . "." : Types: deb URIs: https://deb.debian.org Suites: stable Components: main contrib non-free non-free-firmware Signed-By: -----BEGIN PGP PUBLIC KEY BLOCK----- . mDMEYCQjIxYJKwYBBAHaRw8BAQdAD/P5Nvvnvk66SxBBHDbhRml9ORg1WV5CvzKY CuMfoIS0BmFiY2RlZoiQBBMWCgA4FiEErCIG1VhKWMWo2yfAREZd5NfO31cFAmAk IyMCGyMFCwkIBwMFFQoJCAsFFgIDAQACHgECF4AACgkQREZd5NfO31fbOwD6ArzS dM0Dkd5h2Ujy1b6KcAaVW9FOa5UNfJ9FFBtjLQEBAJ7UyWD3dZzhvlaAwunsk7DG 3bHcln8DMpIJVXht78sL =IE0r -----END PGP PUBLIC KEY BLOCK----- o Check-Valid-Until (check-valid-until) yes/no APT (replay attacks) . . . no . Acquire::Check-Valid-Until yes . o Valid-Until-Min (valid-until-min) Valid-Until-Max (valid-until-max) . -Max Valid-Until Release -Min () ( sources.list ) . Acquire::Min-ValidTime Acquire::Max-ValidTime . o Check-Date (check-date) yes/no APT Release . Check-Valid-Until . o Date-Max-Future (date-max-future) . Acquire::Max-FutureTime 10 . o InRelease-Path (inrelease-path) InRelease InRelease . APT InRelease Release Release.gpg . InRelease (fallback) Release . o Snapshot (snapshot) (snapshot) . : enable () --snapshot (ID) disable . YYYYMMDDTHHMMSSZ 20220102T030405Z :: UTC APT . deb822 . APT .sources . o Contact . RFC5322 URL . o Bugs HTTPS . o Description . . (URI SPECIFICATION) URI : http (apt-transport-http(1)) http HTTP . URI apt_auth.conf(5) . SOCKS5 HTTP(S) apt http_proxy ( HTTP ) : http://user:pass@server:port. apt_auth.conf(5) . ( ) . APT . apt-secure(8) . https (apt-transport-https(1)) https HTTPS http . apt ( ) . apt ( ) . Tor . mirror, mirror+scheme (apt-transport-mirror(1)) mirror (mirrorlist) . http mirror+scheme . URI APT . file file . NFS . cdrom cdrom APT CD-ROM DVD USB . apt-cdrom(8) cdrom . copy copy file (cache) . APT . URI APT apt-transport-method . APT apt-transport-tor URI HTTP HTTPS Tor . (EXAMPLES) ( NFS) /home/apt/debian stable/main stable/contrib stable/non-free stable/non-free-firmware . deb file:/home/apt/debian stable main contrib non-free non-free-firmware Types: deb URIs: file:/home/apt/debian Suites: stable Components: main contrib non-free non-free-firmware () unstable . deb file:/home/apt/debian unstable main contrib non-free non-free-firmware Types: deb URIs: file:/home/apt/debian Suites: unstable Components: main contrib non-free non-free-firmware . deb-src file:/home/apt/debian unstable main contrib non-free non-free-firmware Types: deb-src URIs: file:/home/apt/debian Suites: unstable Components: main contrib non-free non-free-firmware APT::Architectures amd64 armel . deb http://deb.debian.org/debian trixie main deb [ arch=amd64,armel ] http://deb.debian.org/debian trixie main Types: deb URIs: http://deb.debian.org/debian Suites: trixie Components: main Types: deb URIs: http://deb.debian.org/debian Suites: trixie Components: main Architectures: amd64 armel HTTP archive.debian.org hamm/main . deb http://archive.debian.org/debian-archive hamm main Types: deb URIs: http://archive.debian.org/debian-archive Suites: hamm Components: main HTTPS deb.debian.org debian trixie/contrib . deb https://deb.debian.org/debian trixie contrib Types: deb URIs: https://deb.debian.org/debian Suites: trixie Components: contrib HTTPS deb.debian.org debian unstable/contrib . sources.list HTTPS . deb https://deb.debian.org/debian unstable contrib Types: deb URIs: https://deb.debian.org/debian Suites: unstable Components: contrib HTTP ftp.tlh.debian.org universe unstable/binary-i386 i386 unstable/binary-amd64 amd64 . [ ] deb http://ftp.tlh.debian.org/universe unstable/binary-$(ARCH)/ Types: deb URIs: http://ftp.tlh.debian.org/universe Suites: unstable/binary-$(ARCH)/ HTTP stable testing unstable main contrib . deb http://deb.debian.org/debian stable main contrib deb-src http://deb.debian.org/debian stable main contrib deb http://deb.debian.org/debian testing main contrib deb-src http://deb.debian.org/debian testing main contrib deb http://deb.debian.org/debian unstable main contrib deb-src http://deb.debian.org/debian unstable main contrib Types: deb deb-src URIs: http://deb.debian.org/debian Suites: stable testing unstable Components: main contrib (Snapshots) . Types: deb deb-src URIs: http://deb.debian.org/debian Suites: stable testing unstable Snapshot: 20250311T030104Z Components: main contrib --snapshot . Types: deb deb-src URIs: http://deb.debian.org/debian-security Suites: stable-security Snapshot: disable Components: main contrib non-free-firmware (SEE ALSO) apt-get(8), apt.conf(5), /usr/share/doc/apt/acquire-additional-files.md.gz (BUGS) APT[1]. APT /usr/share/doc/debian/bug-reporting.txt reportbug(1) . (AUTHORS) Jason Gunthorpe APT (NOTES) 1. APT https://bugs.debian.org/src:apt APT 3.3.3 09 April 2026 SOURCES.LIST(5)