Ubuntu bionic9/20/2023 ![]() If the keys that your system is missing differs, simply replace the key at the end of the above command with your key and run it. Gpg: key C0B21F32: public key "Ubuntu Archive Automatic Signing Key (2012) " imported Gpg: requesting key C0B21F32 from hkp server $ sudo apt-key adv -keyserver -recv-keys 3B4FE6ACC0B21F32Įxecuting: gpg -ignore-time-conflict -no-options -no-default-keyring -homedir /tmp/tmp.77TqYGKU7b -no-auto-check-trustdb -trust-model always -keyring /etc/apt/trusted.gpg -primary-keyring /etc/apt/trusted.gpg -keyserver -recv-keys 3B4FE6ACC0B21F32 ![]() Gpg: key 437D05B5: public key "Ubuntu Archive Automatic Signing Key " imported Gpg: requesting key 437D05B5 from hkp server This is an LTS (long term support) release the type of release that Canonical only publishes every two years, and continues to support for the next five. To add these keys, run the following commands: $ sudo apt-key adv -keyserver -recv-keys 40976EAF437D05B5Įxecuting: gpg -ignore-time-conflict -no-options -no-default-keyring -homedir /tmp/tmp.QTeppiINUh -no-auto-check-trustdb -trust-model always -keyring /etc/apt/trusted.gpg -primary-keyring /etc/apt/trusted.gpg -keyserver -recv-keys 40976EAF437D05B5 Canonical’s latest iteration to the Ubuntu operating system is Ubuntu 20.04 Focal Fossa, released on April 23, 2020. Each unique key will only need to be added once. Notice that these are listed multiple times. Looking at the error above, apt is telling us that the following keys are missing: 40976EAF437D05B5 and 3B4FE6ACC0B21F32. Each key that is listed as missing needs to be added to the apt key manager so that it can authenticate the packages. Sometimes the system does not have all the keys it needs and runs into this issue. The apt packaging system has a set of trusted keys that determine whether a package can be authenticated and therefore trusted to be installed on the system. For example: $ sudo apt-get upgradeĮ: Some packages could not be authenticated If these errors aren’t fixed, apt will have problems when installing or upgrading packages. W: GPG error: trusty-updates Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32 W: GPG error: trusty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32 W: GPG error: trusty-security Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32 There are times when running apt-get update in Ubuntu will result in error messages such as the following: $ sudo apt-get update
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