为什么sudo apt-get update退出并显示错误？ [关闭]

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[<8天前关闭。

我正在尝试更新我的ubuntu便携式计算机，因此输入以下命令：sudo apt-get update

但是我仍然遇到此错误：

 sudo apt-get update
Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease
Err:2 http://ppa.launchpad.net/jonathonf/python-3.6/ubuntu bionic InRelease                                                      
  403  Forbidden [IP: 91.189.95.83 80]
Hit:3 http://de.archive.ubuntu.com/ubuntu bionic InRelease                                                                       
Get:4 http://dl.google.com/linux/chrome/deb stable Release [943 B]                                                                           
Hit:5 http://de.archive.ubuntu.com/ubuntu bionic-updates InRelease                                                                           
Get:6 http://dl.google.com/linux/chrome/deb stable Release.gpg [819 B]                                                                       
Hit:7 http://security.ubuntu.com/ubuntu bionic-security InRelease                                                                            
Err:6 http://dl.google.com/linux/chrome/deb stable Release.gpg                                                          
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 78BD65473CB3BD13
Hit:8 http://de.archive.ubuntu.com/ubuntu bionic-backports InRelease                              
Hit:9 https://repo.skype.com/deb stable InRelease                                                 
Reading package lists... Done                      
E: Failed to fetch http://ppa.launchpad.net/jonathonf/python-3.6/ubuntu/dists/bionic/InRelease  403  Forbidden [IP: 91.189.95.83 80]
E: The repository 'http://ppa.launchpad.net/jonathonf/python-3.6/ubuntu bionic 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.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://dl.google.com/linux/chrome/deb stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 78BD65473CB3BD13

有人知道为什么会发生这种情况，以及我该如何解决这个问题？我的ubuntu version是18.04。
提前感谢。

Answer 1

您的http://ppa.launchpad.net/jonathonf/python-3.6/ubuntu bionic存储库没有GPG签名，因此无法安全地进行更新。如果要绕过此操作，则应在/etc/apt/sources.list中编辑其条目。如果原始条目如下所示：

deb http://ppa.launchpad.net/jonathonf/python-3.6/ubuntu bionic InRelease

将其更改为此：
deb [trusted=yes] http://ppa.launchpad.net/jonathonf/python-3.6/ubuntu bionic InRelease