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When attempting to update Veeam Agent for Linux to the latest patch 6.3.2.1307 the update fails during with GPG verification errors, preventing access to the Veeam repository and blocking the agent upgrade. Debian-base Error Example: NO_PUBKEY C5A1CF329BB5AC67 The repository 'https://repository.veeam.com/backup/linux/agent/dpkg/debian/public stable InRelease' is not signed. Updating from such a repository can't be done securely, and is therefore disabled by default.
This occurs because the repository signing key used for the Linux agent repository was rotated. The previous signing key was nearing expiration (2026‑03‑15). Veeam replaced the key and moved fully to SHA‑256–based signing. Systems that already had the old key installed did not automatically receive the new public key. As a result, package managers can no longer verify the repository metadata and blocks updates for security reasons.
To resolve this update the veeam-release package, which installs the new repository public key.
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