Updater plugin does not work with .deb packages

[azais-corentin]

Hi,

I have setup the updater plugin and it's working well on Windows, and Linux with AppImage.
The debian package however fails to update with the following error:

[2025-11-18][10:11:16][tauri_plugin_updater::updater][WARN] update is not a valid deb package
[2025-11-18][10:11:16][webview][ERROR] invalid updater binary format

I have manually downloaded the .deb package from the autogenerated latest.json file, and tried to run the deb validation function manually:
Running the infer::archive::is_deb() function on the manually downloaded file works fine and returns true.

I suspect the updater isn't downloading the right file but there's no log to help me debug it.

[FabianLars]

You did nothing wrong, the plugin indeed doesn't support it yet, see #3070 (review) (relevant PR)

[azais-corentin]

I understand that this will be fixed in the next version of the plugin (2.10.0).
Is this correct?

[FabianLars]

That's the plan at least. I'm currently blocking 2.10 as per the linked comment so there's still the possibility that we will revert the changes and re-visit the feature later.

[azais-corentin]

Thanks for your quick answers!