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ubuntu中apt的源更新失败

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  1. 更新系统apt源，修改/etc/apt/sources.list文件内容

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    deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
    #deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse

    deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
    #deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse

    deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
    #deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse

    deb http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
    #deb-src http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse

    deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
    #deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse

  2. 执行sudo apt-get update命令

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    admin@ub20:/etc/apt$ sudo apt-get update 
    Get:1 http://mirrors.aliyun.com/ubuntu focal InRelease [265 kB]
    Get:2 http://mirrors.aliyun.com/ubuntu focal-security InRelease [114 kB]
    Get:3 http://mirrors.aliyun.com/ubuntu focal-updates InRelease [114 kB]
    Get:4 http://mirrors.aliyun.com/ubuntu focal-proposed InRelease [267 kB]
    Get:5 http://mirrors.aliyun.com/ubuntu focal-backports InRelease [108 kB]
    Ign:6 http://mirrors.aliyun.com/ubuntu focal/main arm64 Packages
    Get:7 http://mirrors.aliyun.com/ubuntu focal/main Translation-en [506 kB]
    Get:8 http://mirrors.aliyun.com/ubuntu focal/main arm64 DEP-11 Metadata [489 kB]
    Get:9 http://mirrors.aliyun.com/ubuntu focal/main DEP-11 48x48 Icons [98.4 kB]
    Get:10 http://mirrors.aliyun.com/ubuntu focal/main DEP-11 64x64 Icons [163 kB]
    Get:11 http://mirrors.aliyun.com/ubuntu focal/main DEP-11 64x64@2 Icons [15.8 kB]
    Get:12 http://mirrors.aliyun.com/ubuntu focal/restricted arm64 Packages [1300 B]
    Get:12 http://mirrors.aliyun.com/ubuntu focal/restricted arm64 Packages [1300 B]
    Get:12 http://mirrors.aliyun.com/ubuntu focal/restricted arm64 Packages [1300 B]
    Get:12 http://mirrors.aliyun.com/ubuntu focal/restricted arm64 Packages [1300 B]
    Get:12 http://mirrors.aliyun.com/ubuntu focal/restricted arm64 Packages [1300 B]
    Get:12 http://mirrors.aliyun.com/ubuntu focal/restricted arm64 Packages [1300 B]
    Get:12 http://mirrors.aliyun.com/ubuntu focal/restricted arm64 Packages [1300 B]
    Get:12 http://mirrors.aliyun.com/ubuntu focal/restricted arm64 Packages [1300 B]
    Get:12 http://mirrors.aliyun.com/ubuntu focal/restricted arm64 Packages [1300 B]
    Get:12 http://mirrors.aliyun.com/ubuntu focal/restricted arm64 Packages [1300 B]
    Get:12 http://mirrors.aliyun.com/ubuntu focal/restricted arm64 Packages [1300 B]
    Ign:12 http://mirrors.aliyun.com/ubuntu focal/restricted arm64 Packages
    Ign:24 http://mirrors.aliyun.com/ubuntu focal/universe arm64 Packages
    Ign:25 http://mirrors.aliyun.com/ubuntu focal/multiverse arm64 Packages
    Ign:6 http://mirrors.aliyun.com/ubuntu focal/main arm64 Packages
    Ign:12 http://mirrors.aliyun.com/ubuntu focal/restricted arm64 Packages
    Ign:24 http://mirrors.aliyun.com/ubuntu focal/universe arm64 Packages
    Ign:25 http://mirrors.aliyun.com/ubuntu focal/multiverse arm64 Packages
    Ign:6 http://mirrors.aliyun.com/ubuntu focal/main arm64 Packages
    Ign:12 http://mirrors.aliyun.com/ubuntu focal/restricted arm64 Packages
    Ign:24 http://mirrors.aliyun.com/ubuntu focal/universe arm64 Packages
    Ign:25 http://mirrors.aliyun.com/ubuntu focal/multiverse arm64 Packages
    Ign:6 http://mirrors.aliyun.com/ubuntu focal/main arm64 Packages
    Ign:12 http://mirrors.aliyun.com/ubuntu focal/restricted arm64 Packages
    Ign:24 http://mirrors.aliyun.com/ubuntu focal/universe arm64 Packages
    Ign:25 http://mirrors.aliyun.com/ubuntu focal/multiverse arm64 Packages
    Ign:6 http://mirrors.aliyun.com/ubuntu focal/main arm64 Packages
    Ign:12 http://mirrors.aliyun.com/ubuntu focal/restricted arm64 Packages
    Ign:24 http://mirrors.aliyun.com/ubuntu focal/universe arm64 Packages
    Ign:25 http://mirrors.aliyun.com/ubuntu focal/multiverse arm64 Packages
    Err:6 http://mirrors.aliyun.com/ubuntu focal/main arm64 Packages
      404  Not Found [IP: 182.40.61.237 80]
    Ign:12 http://mirrors.aliyun.com/ubuntu focal/restricted arm64 Packages
    Ign:24 http://mirrors.aliyun.com/ubuntu focal/universe arm64 Packages
    Ign:25 http://mirrors.aliyun.com/ubuntu focal/multiverse arm64 Packages
    Reading package lists... Done       
    E: Release file for http://mirrors.aliyun.com/ubuntu/dists/focal-security/InRelease is not valid yet (invalid for another 628d 4h 16min 47s). Updates for this repository will not be applied.
    E: Release file for http://mirrors.aliyun.com/ubuntu/dists/focal-updates/InRelease is not valid yet (invalid for another 628d 16h 29min 47s). Updates for this repository will not be applied.
    E: Release file for http://mirrors.aliyun.com/ubuntu/dists/focal-proposed/InRelease is not valid yet (invalid for another 628d 12h 18min 41s). Updates for this repository will not be applied.
    E: Release file for http://mirrors.aliyun.com/ubuntu/dists/focal-backports/InRelease is not valid yet (invalid for another 430d 13h 47min 7s). Updates for this repository will not be applied.

    问题原因：

    1. 查看服务器是否能ping通

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      admin@ub20:/etc/apt$ ping mirrors.aliyun.com
      PING mirrors.aliyun.com.w.alikunlun.com (182.40.61.239) 56(84) bytes of data.
      64 bytes from 182.40.61.239: icmp_seq=1 ttl=45 time=20.5 ms
      64 bytes from 182.40.61.239: icmp_seq=2 ttl=45 time=19.8 ms

    2. 将sources.list中的ubuntu都替换为ubuntu-ports

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      deb http://mirrors.aliyun.com/ubuntu-ports/ focal main restricted universe multiverse
      #deb-src http://mirrors.aliyun.com/ubuntu-ports/ focal main restricted universe multiverse

      deb http://mirrors.aliyun.com/ubuntu-ports/ focal-security main restricted universe multiverse
      #deb-src http://mirrors.aliyun.com/ubuntu-ports/ focal-security main restricted universe multiverse

      deb http://mirrors.aliyun.com/ubuntu-ports/ focal-updates main restricted universe multiverse
      #deb-src http://mirrors.aliyun.com/ubuntu-ports/ focal-updates main restricted universe multiverse

      deb http://mirrors.aliyun.com/ubuntu-ports/ focal-proposed main restricted universe multiverse
      #deb-src http://mirrors.aliyun.com/ubuntu-ports/ focal-proposed main restricted universe multiverse

      deb http://mirrors.aliyun.com/ubuntu-ports/ focal-backports main restricted universe multiverse
      #deb-src http://mirrors.aliyun.com/ubuntu-ports/ focal-backports main restricted universe multiverse

      执行sudo apt-get update结果如下：

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      admin@ub20:/etc/apt$ sudo apt update 
      Get:1 http://mirrors.aliyun.com/ubuntu-ports focal InRelease [265 kB]
      Get:2 http://mirrors.aliyun.com/ubuntu-ports focal-security InRelease [114 kB]
      Get:3 http://mirrors.aliyun.com/ubuntu-ports focal-updates InRelease [114 kB]
      Get:4 http://mirrors.aliyun.com/ubuntu-ports focal-proposed InRelease [267 kB]
      Get:5 http://mirrors.aliyun.com/ubuntu-ports focal-backports InRelease [108 kB]
      Get:6 http://mirrors.aliyun.com/ubuntu-ports focal/main arm64 Packages [940 kB]
      Get:7 http://mirrors.aliyun.com/ubuntu-ports focal/main Translation-en [506 kB]                                                                                                                           
      Get:8 http://mirrors.aliyun.com/ubuntu-ports focal/main arm64 DEP-11 Metadata [489 kB]                                                                                                                    
      Get:9 http://mirrors.aliyun.com/ubuntu-ports focal/main DEP-11 48x48 Icons [98.4 kB]                                                                                                                      
      Get:10 http://mirrors.aliyun.com/ubuntu-ports focal/main DEP-11 64x64 Icons [163 kB]                                                                                                                      
      Get:11 http://mirrors.aliyun.com/ubuntu-ports focal/main DEP-11 64x64@2 Icons [15.8 kB]                                                                                                                   
      Get:12 http://mirrors.aliyun.com/ubuntu-ports focal/restricted arm64 Packages [1300 B]                                                                                                                    
      Get:13 http://mirrors.aliyun.com/ubuntu-ports focal/restricted Translation-en [6212 B]                                                                                                                    
      Get:14 http://mirrors.aliyun.com/ubuntu-ports focal/universe arm64 Packages [8458 kB]                                                                                                                     
      Get:15 http://mirrors.aliyun.com/ubuntu-ports focal/universe Translation-en [5124 kB]                                                                                                                     
      Get:16 http://mirrors.aliyun.com/ubuntu-ports focal/universe arm64 DEP-11 Metadata [3587 kB]                                                                                                              
      Get:17 http://mirrors.aliyun.com/ubuntu-ports focal/universe DEP-11 48x48 Icons [3016 kB]                                                                                                                 
      Get:18 http://mirrors.aliyun.com/ubuntu-ports focal/universe DEP-11 64x64 Icons [7794 kB]                                                                                                                 
      Get:19 http://mirrors.aliyun.com/ubuntu-ports focal/universe DEP-11 64x64@2 Icons [44.3 kB]                                                                                                               
      Get:20 http://mirrors.aliyun.com/ubuntu-ports focal/multiverse arm64 Packages [114 kB]                                                                                                                    
      Get:21 http://mirrors.aliyun.com/ubuntu-ports focal/multiverse Translation-en [104 kB]                                                                                                                    
      Get:22 http://mirrors.aliyun.com/ubuntu-ports focal/multiverse arm64 DEP-11 Metadata [44.9 kB]                                                                                                            
      Get:23 http://mirrors.aliyun.com/ubuntu-ports focal/multiverse DEP-11 48x48 Icons [23.1 kB]                                                                                                               
      Get:24 http://mirrors.aliyun.com/ubuntu-ports focal/multiverse DEP-11 64x64 Icons [192 kB]                                                                                                                
      Get:25 http://mirrors.aliyun.com/ubuntu-ports focal/multiverse DEP-11 64x64@2 Icons [214 B]                                                                                                               
      Reading package lists... Done                                                                                                                                                                             
      E: Release file for http://mirrors.aliyun.com/ubuntu-ports/dists/focal-security/InRelease is not valid yet (invalid for another 628d 4h 10min 36s). Updates for this repository will not be applied.
      E: Release file for http://mirrors.aliyun.com/ubuntu-ports/dists/focal-updates/InRelease is not valid yet (invalid for another 628d 10h 32min 57s). Updates for this repository will not be applied.
      E: Release file for http://mirrors.aliyun.com/ubuntu-ports/dists/focal-proposed/InRelease is not valid yet (invalid for another 628d 4h 50min 42s). Updates for this repository will not be applied.
      E: Release file for http://mirrors.aliyun.com/ubuntu-ports/dists/focal-backports/InRelease is not valid yet (invalid for another 430d 13h 40min 54s). Updates for this repository will not be applied.

    3. 通过上网查资料，出现Updates for this repository will not be applied可能是系统时间不对，然后使用date查看时间不同步，如下：

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      admin@ub20:/etc/apt$ date -R
      Thu, 08 Sep 2022 18:59:29 +0800

      使用timedatectl命令更新系统时间后，执行sudo apt-get update成功。

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      admin@ub20:/etc/apt$ timedatectl
                     Local time: Thu 2022-09-08 19:09:25 CST
                 Universal time: Thu 2022-09-08 11:09:25 UTC
                       RTC time: Thu 1970-01-01 01:11:27    
                      Time zone: Asia/Shanghai (CST, +0800) 
      System clock synchronized: no                         
                    NTP service: inactive                   
                RTC in local TZ: no                         
      admin@ub20:/etc/apt$ E: Release file for http://mirrors.aliyun.com/ubuntu-ports/dists/focal-security/InRelease is not valid yet (invalid for another 628d 4h 2min 55s). Updates for this repository will not be applied.^C
      admin@ub20:/etc/apt$ timedatectl list-timezones
      Africa/Abidjan
      Africa/Accra
      America/North_Dakota/Beulah
      America/North_Dakota/Center
      America/North_Dakota/New_Salem
      ...
      Asia/Seoul
      Asia/Shanghai
      admin@ub20:/etc/apt$ sudo timedatectl set-timezone Asia/Shanghai
      admin@ub20:/etc/apt$ sudo timedatectl set-ntp true
      admin@ub20:/etc/apt$ date
      Wed May 29 16:05:07 CST 2024
      admin@ub20:/etc/apt$ 
      admin@ub20:/etc/apt$ sudo apt-get update 
      [sudo] password for admin: 
      Hit:1 http://mirrors.aliyun.com/ubuntu-ports focal InRelease
      Get:2 http://mirrors.aliyun.com/ubuntu-ports focal-security InRelease [114 kB]
      Get:3 http://mirrors.aliyun.com/ubuntu-ports focal-updates InRelease [114 kB]
      Get:4 http://mirrors.aliyun.com/ubuntu-ports focal-proposed InRelease [267 kB]
      Get:5 http://mirrors.aliyun.com/ubuntu-ports focal-backports InRelease [108 kB]
      Get:6 http://mirrors.aliyun.com/ubuntu-ports focal-security/main arm64 Packages [2243 kB]
      Get:7 http://mirrors.aliyun.com/ubuntu-ports focal-security/main Translation-en [443 kB]                                   ...                                                                                                  
      Get:71 http://mirrors.aliyun.com/ubuntu-ports focal-backports/universe DEP-11 48x48 Icons [13.3 kB]                                                                                
      Get:72 http://mirrors.aliyun.com/ubuntu-ports focal-backports/universe DEP-11 64x64 Icons [22.7 kB]                                                                                                       
      Get:73 http://mirrors.aliyun.com/ubuntu-ports focal-backports/universe DEP-11 64x64@2 Icons [29 B]                                                                                                        
      Fetched 12.3 MB in 57s (216 kB/s)                                                                                                                                                                         
      Reading package lists... Done
      admin@ub20:/etc/apt$