Package: packages.x2go.org
Hi!
Repository signing with SHA1 is deprecated in testing:
http://packages.x2go.org/debian/dists/stretch/InRelease: Signature by key 972FD88FA0BAFB578D0476DFE1F958385BFE2B6E uses weak digest algorithm (SHA1)
Please update your configuration to use SHA256: https://wiki.debian.org/SettingUpSignedAptRepositoryWithReprepro#Generating_...
Thanks!