Ubuntu Manpage: apt-key - Deprecated APT key management utility

NAME

       apt-key - Deprecated APT key management utility

SYNOPSIS

       apt-key [--keyring filename] {add filename | del keyid | export keyid | exportall | list |
               finger | adv | update | net-update | {-v | --version} | {-h | --help}}

DESCRIPTION

       apt-key is used to manage the list of keys used by apt to authenticate packages. Packages
       which have been authenticated using these keys will be considered trusted.

       Use of apt-key is deprecated, except for the use of apt-key del in maintainer scripts to
       remove existing keys from the main keyring. If such usage of apt-key is desired the
       additional installation of the GNU Privacy Guard suite (packaged in gnupg) is required.

       apt-key(8) will last be available in Debian 11 and Ubuntu 22.04.

SUPPORTED KEYRING FILES

       apt-key supports only the binary OpenPGP format (also known as "GPG key public ring") in
       files with the "gpg" extension, not the keybox database format introduced in newer gpg(1)
       versions as default for keyring files. Binary keyring files intended to be used with any
       apt version should therefore always be created with gpg --export.

       Alternatively, if all systems which should be using the created keyring have at least apt
       version >= 1.4 installed, you can use the ASCII armored format with the "asc" extension
       instead which can be created with gpg --armor --export.

COMMANDS

add filename (deprecated)
Add a new key to the list of trusted keys. The key is read from the filename given
with the parameter filename or if the filename is - from standard input.

It is critical that keys added manually via apt-key are verified to belong to the
owner of the repositories they claim to be for otherwise the apt-secure(8)
infrastructure is completely undermined.

Note: Instead of using this command a keyring should be placed directly in the
/etc/apt/trusted.gpg.d/ directory with a descriptive name and either "gpg" or "asc" as
file extension.

del keyid (mostly deprecated)
Remove a key from the list of trusted keys.

export keyid (deprecated)
Output the key keyid to standard output.

exportall (deprecated)
Output all trusted keys to standard output.

list, finger (deprecated)
List trusted keys with fingerprints.

adv (deprecated)
Pass advanced options to gpg. With adv --recv-key you can e.g. download key from
keyservers directly into the trusted set of keys. Note that there are no checks
performed, so it is easy to completely undermine the apt-secure(8) infrastructure if
used without care.

update (deprecated)
Update the local keyring with the archive keyring and remove from the local keyring
the archive keys which are no longer valid. The archive keyring is shipped in the
archive-keyring package of your distribution, e.g. the ubuntu-keyring package in
Ubuntu.

Note that a distribution does not need to and in fact should not use this command any
longer and instead ship keyring files in the /etc/apt/trusted.gpg.d/ directory
directly as this avoids a dependency on gnupg and it is easier to manage keys by
simply adding and removing files for maintainers and users alike.

net-update (deprecated)
Perform an update working similarly to the update command above, but get the archive
keyring from a URI instead and validate it against a master key. This requires an
installed wget(1) and an APT build configured to have a server to fetch from and a
master keyring to validate. APT in Debian does not support this command, relying on
update instead, but Ubuntu's APT does.

OPTIONS

       Note that options need to be defined before the commands described in the previous
       section.

       --keyring filename (deprecated)
           With this option it is possible to specify a particular keyring file the command
           should operate on. The default is that a command is executed on the trusted.gpg file
           as well as on all parts in the trusted.gpg.d directory, though trusted.gpg is the
           primary keyring which means that e.g. new keys are added to this one.

DEPRECATION

       Except for using apt-key del in maintainer scripts, the use of apt-key is deprecated. This
       section shows how to replace existing use of apt-key.

       If your existing use of apt-key add looks like this:

       wget -qO- https://myrepo.example/myrepo.asc | sudo apt-key add -

       Then you can directly replace this with (though note the recommendation below):

       wget -qO- https://myrepo.example/myrepo.asc | sudo tee /etc/apt/trusted.gpg.d/myrepo.asc

       Make sure to use the "asc" extension for ASCII armored keys and the "gpg" extension for
       the binary OpenPGP format (also known as "GPG key public ring"). The binary OpenPGP format
       works for all apt versions, while the ASCII armored format works for apt version >= 1.4.

       Recommended: Instead of placing keys into the /etc/apt/trusted.gpg.d directory, you can
       place them anywhere on your filesystem by using the Signed-By option in your sources.list
       and pointing to the filename of the key. See sources.list(5) for details. Since APT 2.4,
       /etc/apt/keyrings is provided as the recommended location for keys not managed by
       packages. When using a deb822-style sources.list, and with apt version >= 2.4, the
       Signed-By option can also be used to include the full ASCII armored keyring directly in
       the sources.list without an additional file.

FILES

       /etc/apt/trusted.gpg
           Keyring of local trusted keys, new keys will be added here. Configuration Item:
           Dir::Etc::Trusted.

       /etc/apt/trusted.gpg.d/
           File fragments for the trusted keys, additional keyrings can be stored here (by other
           packages or the administrator). Configuration Item Dir::Etc::TrustedParts.

       /etc/apt/keyrings/
           Place to store additional keyrings to be used with Signed-By.

BUGS

       APT bug page[1]. If you wish to report a bug in APT, please see
       /usr/share/doc/debian/bug-reporting.txt or the reportbug(1) command.

AUTHOR

       APT was written by the APT team <apt@packages.debian.org>.

AUTHORS

       Jason Gunthorpe

       APT team

NOTES

        1. APT bug page
           http://bugs.debian.org/src:apt