W: The repository '
https://packages.inverse.ca/SOGo/release/3/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W:
https://s3.amazonaws.com/dgri-apt-repo/dists/production/InRelease: Signature by key DED6B1C40DEF61E82E1B39352D7DBF9D4
04D2E7A uses weak digest algorithm (SHA1)
E: Failed to fetch
https://packages.inverse.ca/SOGo/release/3/ubuntu/dists/xenia
l/xenial/binary-amd64/Packages 401 Authorization Required
E: Some index files failed to download. They have been ignored, or old ones used instead.