@MarcDuTonkin,

You’re absolutely right: running snap refresh on a machine without internet access will fail, since Snap relies on the Snap Store, which requires a direct internet connection to fetch updates.

Unfortunately, Snap doesn’t support offline or mirror-based updates in the same way that APT does. As of now, there’s no official mechanism for hosting a fully offline Snap mirror repository or for distributing updated Snap packages across an air-gapped/local network.

Let me clarify my question.

One of the key advantages of setting up a mirror repository is the ability to update a group of machines that do not have internet access. These machines are connected to a local network, and to update them, we use a station that hosts the mirror repository.

This station will first connect to the Internet to update the mirror repository, and then be reconnected to the local network to distribute the updates.

With the command you referenced, the station hosting the mirror will successfully update its own snap packages. But how do we then distribute those updates to the offline machines on the local network?

If we run the snap refresh command directly on one of those offline machines, it will fail due to the lack of Internet access. So how should the update process be handled in that case?

@Marcdutonkin,

To update all Snap packages on Ubuntu, just run:

sudo snap refresh

This command checks for available updates and applies them to all installed Snap packages.

@Peter,

It’s possible that there are no updates available for your system at that time. The system may already have the latest packages installed.

Sometimes, there might be issues with the repository sources. so make sure that your /etc/apt/sources.list file is correctly configured to point to the appropriate repositories.