ownCloud repositories got a new PGP key



please be aware that the maintainer of the ownCloud repositories at:


are currently updating the PGP keys. You might need to re-import the key by following the instructions shown at the download pages.

Apt-get update : Erreur de GPG : NO_PUBKEY 4ABE1AC7557BEFF9
Repository kann nicht aktualisiert werden

If someone is still struggling with messages like:

Signature by key DDA2C105C4B73A6649AD2BBD47AE7F72479BC94B uses weak digest algorithm (SHA1

please follow these instructions:

I was able to fix it by removing the package source, followed by running apt-get update. After adding the source again, everything installed fine. Weirdly just running apt-get clean instead, which I thought does the same, did not fix my issue.

Source: https://github.com/owncloud/client/issues/5055#issuecomment-255063655