Yeah 
Update-Manager is working now. It was a OpenSSL problem.
What's with /etc/update-manager/meta-release?
Can I use?
#'https'#
URI = https://changelogs.ubuntu.com/meta-release
URI_LTS = https://changelogs.ubuntu.com/meta-release-lts
or should it?
URI = http://changelogs.ubuntu.com/meta-release
URI_LTS = http://changelogs.ubuntu.com/meta-release-lts