While I am updating Jenkins server - see:
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://pkg.jenkins.io/debian-stable binary/ Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY FCEF32E745F2C3D5 W: Failed to fetch http://pkg.jenkins.io/debian-stable/binary/Release.gpg The following signatures couldn't be verified because the public key is not available: NO_PUBKEY FCEF32E745F2C3D5 W: Some index files failed to download. They have been ignored, or old ones used instead.
How to fix:
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys FCEF32E745F2C3D5
Executing: /tmp/tmp.ABvN67J5Hp/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys FCEF32E745F2C3D5 gpg: requesting key 45F2C3D5 from hkp server keyserver.ubuntu.com gpg: key 45F2C3D5: public key "Jenkins Project <firstname.lastname@example.org>" imported gpg: Total number processed: 1 gpg: imported: 1 (RSA: 1)
Try to upgrade:
$sudo apt upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done The following packages were automatically installed and are no longer required: linux-aws-headers-4.4.0-1110 linux-aws-headers-4.4.0-1111 linux-aws-headers-4.4.0-1112 linux-aws-headers-4.4.0-1113 linux-aws-headers-4.4.0-1114 Use 'sudo apt autoremove' to remove them. The following packages will be upgraded: jenkins 1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. Need to get 66.9 MB of archives. After this operation, 825 kB of additional disk space will be used. Do you want to continue? [Y/n] y Get:1 https://pkg.jenkins.io/debian-stable binary/ jenkins 2.263.2 [66.9 MB] Fetched 66.9 MB in 12s (5,188 kB/s) (Reading database ... 222449 files and directories currently installed.) Preparing to unpack .../jenkins_2.263.2_all.deb ... Unpacking jenkins (2.263.2) over (2.235.2) ... Processing triggers for systemd (229-4ubuntu21.29) ... Processing triggers for ureadahead (0.100.0-19.1) ... Setting up jenkins (2.263.2) ... Installing new version of config file /etc/init.d/jenkins ... Processing triggers for systemd (229-4ubuntu21.29) ... Processing triggers for ureadahead (0.100.0-19.1) ...