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I am attempting to upgrade from Ubuntu 18.04.6 LTS. Running sudo apt update fails with message The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 76F1A20FF987672F. The thing is this key does exist. sudo apt-key list returns

pub   rsa3072 2018-12-10 [SC]
      D43F 6401 4536 9C51 D786  DDEA 76F1 A20F F987 672F
uid           [ unknown] WineHQ packages <wine-devel@winehq.org>

I even tried deleting and recreating the key. Full output from sudo apt update

Hit:1 https://linux.teamviewer.com/deb stable InRelease
Hit:2 http://archive.ubuntu.com/ubuntu bionic InRelease                                                                                                   
Get:3 https://dl.winehq.org/wine-builds/ubuntu focal InRelease [8,041 B]                                                                                  
Hit:4 http://security.ubuntu.com/ubuntu bionic-security InRelease                                                                                         
Hit:5 https://download.docker.com/linux/ubuntu bionic InRelease                                                                                           
Ign:6 https://pkg.jenkins.io/debian-stable binary/ InRelease                                                                                              
Ign:7 https://pkg.jenkins.io/debian binary/ InRelease                                                                                                     
Hit:8 http://packages.microsoft.com/repos/code stable InRelease                                                                                           
Hit:9 https://pkg.jenkins.io/debian-stable binary/ Release                                                                                                
Hit:10 https://pkg.jenkins.io/debian binary/ Release                                                                                                      
Hit:11 http://dl.google.com/linux/chrome/deb stable InRelease                                                                                             
Hit:12 https://packages.microsoft.com/repos/ms-teams stable InRelease                                                                                     
Hit:13 http://ppa.launchpad.net/canonical-hwe-team/backport-iwlwifi/ubuntu bionic InRelease                                                               
Err:3 https://dl.winehq.org/wine-builds/ubuntu focal InRelease                                                                                            
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 76F1A20FF987672F
Ign:14 https://dl.bintray.com/sbt/debian  InRelease                                                                                                       
Hit:15 https://deb.nodesource.com/node_10.x bionic InRelease                                                                                              
Err:16 https://dl.bintray.com/sbt/debian  Release                                                                                                         
  404  Not Found [IP: 52.21.37.199 443]
Hit:18 http://us.archive.ubuntu.com/ubuntu bionic InRelease                                                                                               
Hit:19 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease                                                                                       
Hit:20 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease                                                                                     
Hit:21 http://ppa.launchpad.net/fontforge/fontforge/ubuntu bionic InRelease                                                                               
Hit:25 http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu bionic InRelease                                                                              
Hit:26 https://ftp.postgresql.org/pub/pgadmin/pgadmin4/apt/bionic pgadmin4 InRelease                                         
Hit:17 https://packagecloud.io/AtomEditor/atom/any any InRelease                                                             
Hit:27 http://ppa.launchpad.net/remmina-ppa-team/remmina-next/ubuntu bionic InRelease                  
Hit:24 https://packagecloud.io/slacktechnologies/slack/debian jessie InRelease                        
Hit:28 http://ppa.launchpad.net/webupd8team/java/ubuntu bionic InRelease
Reading package lists... Done                       
W: GPG error: https://dl.winehq.org/wine-builds/ubuntu focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 76F1A20FF987672F
E: The repository 'https://dl.winehq.org/wine-builds/ubuntu focal InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'https://dl.bintray.com/sbt/debian  Release' no longer has a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
Mark Weber
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  • Related: Are PPAs safe... When you add a PPA or other source to your system, you're changing the composition of your system and its available software. This can cause problems with dependencies for other software, especially if you add sources that are outdated or incompatible. Several of your sources are outdated and/or incompatible. Depending on how long this condition has existed on your system, it may be more difficult to fix problems. Reinstalling a supported release may be the best path forward. – Nmath Jun 03 '23 at 01:52
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    This question is aimed at: '...asking how to upgrade to a supported release.' So as long as it is supported release, which is not clear I admit, the question should be ok. The Original Poster will make life easier by specifying what is the targeted upgrade version of Ubuntu; although this is not the centre of the issue faced here... – andrew.46 Jun 03 '23 at 04:20
  • wine-noob saying this: remove wine to allow upgrade, reinstall after upgrade. Note: software added after a "clean install" is likely to be a hindrance in upgrades. – Hannu Jun 03 '23 at 06:31
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    Also, see here: https://askubuntu.com/questions/1103240/signature-verification-error-for-wine-index-files-failed-to-download-changin – Artur Meinild Jun 03 '23 at 11:20
  • see also How to fix: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY – milahu Dec 22 '23 at 15:00

1 Answers1

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Seems like you're missing the pub key? You can try pulling Debian keys from the Ubuntu Keyserver like such:

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 76F1A20FF987672F
Dylan Rucker
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