[Close Issue] A combination of external contributor fixes (HTTPS redirection) and configuration fix (rollback to the correct GPG key) fixed the issues. Closing as confirmed by 3 different users (on GitHub and IRC).
 Details and follow up on the following GitHub issue: https://github.com/jenkins-infra/helpdesk/issues/2957.
[Open Issue] The Debian package installer fails to install from pkg.jenkins.io.
The failure message is:
Err:2 https://pkg.jenkins.io/debian binary/ jenkins 2.349 Redirection from https to 'http://mirrors.jenkins.io/debian/jenkins_2.349_all.deb' is forbidden [IP: 220.127.116.11 443] Fetched 248 kB in 0s (2256 kB/s) E: Failed to fetch https://pkg.jenkins.io/debian/binary/jenkins_2.349_all.deb E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
# wget https://get.jenkins.io/debian-stable/jenkins_2.332.3_all.deb # dpkg -i jenkins_2.332.3_all.deb
# wget https://get.jenkins.io/debian/jenkins_2.349_all.deb # dpkg -i jenkins_2.349_all.deb
Last updated: May 31, 2022 at 10:42 AM