Thank you vkolacek!
I can add it is not enough to
- deinstall then reinstall Nextcloud
- reformat the external disk (losing all stored data, I suppose)
I agree this package is flagged ‘experimental’, but such a behavior is a significant regression…
At the very least one would have appreciated a warning, to prevent Nextcloud users from updating…
And anyway : what can we try now?
Thank you!