我使用了这里给出的所有答案：“GPG 错误：发布：以下签名无效：BADSIG”
但我仍然每次都会遇到同样的错误：
Reading package lists... Done
W: GPG error: http://archive.canonical.com precise Release:
The following signatures were invalid: 630239CC130E1A7FD81A27B140976EAF437D05B5
E: The repository 'http://archive.canonical.com precise Release' 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.
第一次尝试：
ahadji05@ahadji05-UX330UAR:~$ gpg --keyserver keyserver.ubuntu.com --recv-keys 16126D3A3E5C1192
gpg: key 16126D3A3E5C1192: 3 signatures not checked due to missing keys
gpg: key 16126D3A3E5C1192: public key "Ubuntu Extras Archive Automatic
Signing Key <[email protected]>" imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg: imported: 1
ahadji05@ahadji05-UX330UAR:~$ gpg --export --armor 16126D3A3E5C1192 | sudo apt-key add -
OK
ahadji05@ahadji05-UX330UAR:~$ sudo apt-get update
Ign:1 http//archive.canonical.com precise InRelease
Hit:2 http//security.ubuntu.com/ubuntu bionic-security InRelease
Reading package lists... Done
W: GPG error: http://archive.canonical.com precise Release:
The following signatures were invalid: 630239CC130E1A7FD81A27B140976EAF437D05B5
E: The repository 'http://archive.canonical.com precise Release' 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.
然后我尝试了这个：
ahadji05@ahadji05-UX330UAR:~$ sudo -i
root@ahadji05-UX330UAR:~# apt-get clean
root@ahadji05-UX330UAR:~# cd /var/lib/apt
root@ahadji05-UX330UAR:/var/lib/apt# mv lists lists.old
root@ahadji05-UX330UAR:/var/lib/apt# mkdir -p lists/partial
root@ahadji05-UX330UAR:/var/lib/apt# apt-get clean
root@ahadji05-UX330UAR:/var/lib/apt# apt-get update
Ign:1 http//archive.canonical.com precise InRelease
Get:2 http//sd.archive.ubuntu.com/ubuntu bionic InRelease [242 kB]
Get:3 http//archive.canonical.com precise Release [8,180 B]
Get:4 http//archive.canonical.com precise Release.gpg [181 B]
Get:5 http//security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Get:6 http//sd.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Ign:4 http//archive.canonical.com precise Release.gpg
........
Get:70 http//sd.archive.ubuntu.com/ubuntu bionic-backports/universe translation-en [1,604 B]
Get:71 http//sd.archive.ubuntu.com/ubuntu bionic-backports/universe amd64 DEP-11 Metadata [7,352 B]
Get:72 http//sd.archive.ubuntu.com/ubuntu bionic-backports/universe DEP-11 48x48 Icons [29 B]
Get:73 http//sd.archive.ubuntu.com/ubuntu bionic-backports/universe DEP-11 64x64 Icons [29 B]
Reading package lists... Done
W: GPG error: http//archive.canonical.com precise Release:
The following signatures were invalid: 630239CC130E1A7FD81A27B140976EAF437D05B5
E: The repository 'http//archive.canonical.com precise Release' 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.
最后是这个：
ahadji05@ahadji05-UX330UAR:~$ sudo apt-get clean
ahadji05@ahadji05-UX330UAR:~$ sudo mv /var/lib/apt/lists /tmp
ahadji05@ahadji05-UX330UAR:~$ sudo mkdir -p /var/lib/apt/lists/partial
ahadji05@ahadji05-UX330UAR:~$ sudo apt-get clean
ahadji05@ahadji05-UX330UAR:~$ sudo apt-get update
Ign:1 http//archive.canonical.com precise InRelease
Get:2 http//sd.archive.ubuntu.com/ubuntu bionic InRelease [242 kB]
Get:3 http//archive.canonical.com precise Release [8,180 B]
Get:4 http//archive.canonical.com precise Release.gpg [181 B]
Ign:4 http//archive.canonical.com precise Release.gpg
Get:5 http//security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Get:6 http//sd.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Get:7 http//sd.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Get:8 http//sd.archive.ubuntu.com/ubuntu bionic/main i386 Packages [1,007 kB]
Get:9 http//sd.archive.ubuntu.com/ubuntu bionic/main amd64 Packages [1,019 kB]
Get:10 http//security.ubuntu.com/ubuntu bionic-security/main amd64 Packages [269 kB]
Get:11 http//sd.archive.ubuntu.com/ubuntu bionic/main Translation-en [516 kB]
.......
Get:72 http//sd.archive.ubuntu.com/ubuntu bionic-backports/universe DEP-11 48x48 Icons [29 B]
Get:73 http//sd.archive.ubuntu.com/ubuntu bionic-backports/universe DEP-11 64x64 Icons [29 B]
Reading package lists... Done
W: GPG error: http//archive.canonical.com precise Release:
The following signatures were invalid: 630239CC130E1A7FD81A27B140976EAF437D05B5
E: The repository 'http//archive.canonical.com precise Release' 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.
在所有情况下我都遇到了同样的错误......
答案1
删除过时的存储库sources.list
这个问题与 Ubuntu 18.04 Bionic 有关。原作者错误地添加了 Ubuntu 12.04 Precise 的过时存储库，该存储库已过期。此过时存储库已不存在，并导致错误：
E: The repository 'http//archive.canonical.com precise Release' is not signed.
解决方案是从中删除有问题的行sources.list。
GUI 方法：
打开“软件和更新”程序
然后转到其他软件选项卡：
查找每一行精确的在其上。一次突出显示一行。按下Remove窗口底部的按钮。
对所有行重复精确的在上面。这些行指的是 Ubuntu 12.04 的过时存储库。您正在使用 Ubuntu 18.04，这是当前支持的版本之一。
命令行方法：
按Ctrl++打开终端并输入：AltT
sudo nano /etc/apt/sources.list
现在您就可以编辑该sources.list文件了。查找以下行：
deb http://archive.ubuntu.com/ubuntu precise Release
删除此行以及任何其他行精确的在里面。
nano按 Ctrl+退出编辑器X。编辑器将提示您保存更改。按Y然后Enter按 选择默认文件名。
希望这可以帮助