When I execute sudo apt-get update I get the following errors or warnings:
W: http://packages.urukproject.org/dists/lugalbanda/InRelease: Signature by key F094C518D6F659B7783F25866B3C79D5138BA0FE uses weak digest algorithm (SHA1) W: GPG error: http://linux-libre.fsfla.org/pub/linux-libre/freesh freesh InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9D0DB31B545A3198 W: The repository 'http://linux-libre.fsfla.org/pub/linux-libre/freesh freesh InRelease' is not signed. 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.
