Ubuntu 16.04 - 软件更新程序不显示任何更新

Question

自从软件更新程序没有显示 Ubuntu 16.04 的任何更新以来，已经将近六天了。

我已经尝试过这个解决方案，但没有奏效。软件更新程序显示以下信息：

运行后终端输出sudo apt-get update为：

hirak@ubuntu:~$ sudo apt-get update
Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 http://dl.google.com/linux/chrome/deb stable Release          
Hit:3 http://in.archive.ubuntu.com/ubuntu xenial InRelease          
Ign:5 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial InRelease                            
Get:6 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]                    
Get:7 http://in.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]                           
Hit:8 http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu xenial InRelease                 
Hit:9 http://ppa.launchpad.net/webupd8team/java/ubuntu xenial InRelease                                              
Get:10 http://in.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]                                       
Ign:11 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial Release                      
Ign:12 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main amd64 Packages          
Ign:13 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main i386 Packages       
Ign:14 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main all Packages
Ign:15 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main Translation-en_IN
Ign:16 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main Translation-en
Ign:17 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:18 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main DEP-11 64x64 Icons
Ign:12 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main amd64 Packages
Ign:13 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main i386 Packages
Ign:14 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main all Packages
Ign:15 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main Translation-en_IN
Ign:16 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main Translation-en
Ign:17 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:18 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main DEP-11 64x64 Icons                                                    
Ign:12 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main amd64 Packages                                                        
Ign:13 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main i386 Packages                                                         
Ign:14 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main all Packages                                                          
Ign:15 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main Translation-en_IN                                                     
Ign:16 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main Translation-en                                                        
Ign:17 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main amd64 DEP-11 Metadata                                                 
Ign:18 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main DEP-11 64x64 Icons                                                    
Ign:12 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main amd64 Packages                                                        
Ign:13 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main i386 Packages                                                         
Ign:14 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main all Packages                                                          
Ign:15 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main Translation-en_IN                                                     
Ign:16 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main Translation-en                                                        
Ign:17 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main amd64 DEP-11 Metadata                                                 
Ign:18 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main DEP-11 64x64 Icons                                                    
Ign:12 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main amd64 Packages                                                        
Ign:13 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main i386 Packages                                                         
Ign:14 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main all Packages                                                          
Ign:15 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main Translation-en_IN
Ign:16 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main Translation-en
Ign:17 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:18 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main DEP-11 64x64 Icons
Err:12 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main amd64 Packages
404  Not Found
Ign:13 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main i386 Packages
Ign:14 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main all Packages
Ign:15 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main Translation-en_IN
Ign:16 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main Translation-en
Ign:17 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:18 http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial/main DEP-11 64x64 Icons
Fetched 306 kB in 16s (18.4 kB/s)
Reading package lists... Done
W: The repository 'http://ppa.launchpad.net/nae-team/ppa/ubuntu xenial                         Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://ppa.launchpad.net/nae-team/ppa/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.

运行后终端输出sudo apt-get dist-upgrade为：

hirak@ubuntu:~$ sudo apt-get dist-upgrade
[sudo] password for hirak: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
hirak@ubuntu:~$ 

问题是什么 ？如何解决这个问题？请帮助我......提前致谢......

Answer 1

两件事 - 首先：launchpad.net/nae-team存储库没有适用于 Ubuntu 16.04 的软件包。
这就是您收到错误消息的原因 - 要删除 PPA，请执行以下命令：

sudo apt install ppa-purge  
sudo ppa-purge nae-team/ppa  
sudo apt update  

第二：最近几天没有发布 Ubuntu 16.04 的更新-> Ubuntu 更新
这就是你这么多天没有收到 Ubuntu 16.04 LTS 更新的简单原因。

最后一次更新是2016 年 12 月 28 日来自backportsrepo 的lxd (2.7-0ubuntu2~ubuntu16.04.1)。
在此日期之后发布的 Ubuntu 16.04 的第一次更新是从 2017-01-03 UTC 时间 18.00 开始的。

更新解决您的评论，您仍然收到错误消息- 按以下步骤操作。

/etc/apt/sources.list.d通过运行以下命令检查文件夹中的 PPA 条目：sudo ls -l /etc/apt/sources.list.d然后删除所有nae-team相关.list文件。
通过运行删除每个文件：sudo rm /etc/apt/sources.list.d/<name-of-the-file>.list

还可以/etc/apt/sources.list通过运行以下命令检查文件：sudo nano /etc/apt/sources.list
删除 PPA 的所有现有条目，然后按Ctrl+X关闭文件并Y保存这些更改。之后sudo apt update再次执行，现在它应该按预期工作。