With the update to 19.04 my dell repository is not working as it is marked as not signed. This is the error I get:
Ign:11 http://dell.archive.canonical.com/updates xenial-dell Release.gpg
W: GPG error: http://dell.archive.canonical.com/updates xenial-dell Release: Detached signature file '/var/lib/apt/lists/partial/dell.archive.canonical.com_updates_dists_xenial-dell_Release.gpg' is in unsupported binary format
E: The repository 'http://dell.archive.canonical.com/updates xenial-dell Release' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
I've tried with the xenial-dell and bionic-dell. You can see all the repos here.
There are Release and Release.gpg files in both repositories:
I've searched on Ask Ubuntu and elsewhere but I have not been able to find a working solution.