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如何修复 NO_PUBKEY、EXPKEYSIG、签名无效、sudo apt update 和存储库未签名错误？

tag-icon • tag-icon apt package-management upgrade do-release-upgrade
如何修复 NO_PUBKEY、EXPKEYSIG、签名无效、sudo apt update 和存储库未签名错误？

Ubuntu 20.04 LTS Focal Fossa

我对此感到力不从心。目标是直接升级到 22.04，而无需运行安装程序并丢失所有自定义设置。运行软件更新程序后，会出现一条消息，邀请我升级发行版，但除非我先升级所有已安装的软件包，否则不会继续。

但~$ sudo apt upgrade会出现一堆错误。我已执行 AskUbuntu 中建议的各种补救措施，但效果参差不齐。有人能告诉我这些gpg错误是什么以及如何修复它们吗？

    ~$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 4C6E74D6C0A35108 C793BFA2FA577F07 BF68EA4C8BDD0697 FC918B335044912E 5606C8D03F9E5FB8  
    Executing: /tmp/apt-key-gpghome.n6cG209zwC/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys 4C6E74D6C0A35108 C793BFA2FA577F07 BF68EA4C8BDD0697 FC918B335044912E 5606C8D03F9E5FB8  
    gpg: key 5606C8D03F9E5FB8: "home:hpcoder1 OBS Project <home:[email protected]>" 1 new signature  
    gpg: key FC918B335044912E: public key "Dropbox Automatic Signing Key <[email protected]>" imported  
    gpg: key BF68EA4C8BDD0697: public key "Launchpad PPA for bitseater" imported  
    gpg: key C793BFA2FA577F07: public key "Launchpad PPA for Alexander Larsson" imported  
    gpg: key B75442BBDE9E3B09: public key "https://packagecloud.io/AtomEditor/atom (https://packagecloud.io/docs#gpg_signing) <[email protected]>" imported  
    gpg: Total number processed: 5  
    gpg:               imported: 4  
    gpg:         new signatures: 1  
    gpg: invalid key resource URL '/tmp/apt-key-gpghome.n6cG209zwC/home:hpcoder1.asc.gpg'  
    gpg: keyblock resource '(null)': General error  
    gpg: key 7721F63BD38B4796: 2 signatures not checked due to missing keys  
    gpg: key A6A19B38D3D831EF: 2 signatures not checked due to missing keys  
    gpg: key CD55515EEBDB2B90: 1 signature not checked due to a missing key  
    gpg: key 7721F63BD38B4796: 2 signatures not checked due to missing keys  
    gpg: key 7721F63BD38B4796: 2 signatures not checked due to missing keys  
    gpg: key 5606C8D03F9E5FB8: 1 signature not checked due to a missing key  
    gpg: key 5606C8D03F9E5FB8: 1 signature not checked due to a missing key  
    gpg: key 5606C8D03F9E5FB8: 1 signature not checked due to a missing key  
    gpg: key 3B4FE6ACC0B21F32: 3 signatures not checked due to missing keys  
    gpg: key D94AA3F0EFE21092: 3 signatures not checked due to missing keys  
    gpg: key C8CAB6595FDFF622: 2 signatures not checked due to missing keys  
    gpg: key 871920D1991BC93C: 1 signature not checked due to a missing key  
    gpg: Total number processed: 39  
    gpg:       skipped new keys: 39

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