ubuntu20.04 更换国内163源、阿里源、清华源、中科大源

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第一步：备份源文件：

1. sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup

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第二步：编辑/etc/apt/sources.list文件

在文件最前面添加以下条目(操作前请做好相应备份)：

1. vi /etc/apt/sources.list

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按esc, 键入dG,删除已有文字。（dG:猜测为delete Global）

第三步：复制清华源
esc -- : -- wq
第四步：apt update && apt upgrade

1. <p>网易163源</p><p>
   
2. # 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
   
3. 
   
4. deb http://mirrors.163.com/ubuntu/ focal main restricted universe multiverse
   
5. deb http://mirrors.163.com/ubuntu/ focal-security main restricted universe multiverse
   
6. deb http://mirrors.163.com/ubuntu/ focal-updates main restricted universe multiverse
   
7. deb http://mirrors.163.com/ubuntu/ focal-backports main restricted universe multiverse
   
8. # deb-src http://mirrors.163.com/ubuntu/ focal main restricted universe multiverse
   
9. # deb-src http://mirrors.163.com/ubuntu/ focal-security main restricted universe multiverse
   
10. # deb-src http://mirrors.163.com/ubuntu/ focal-updates main restricted universe multiverse
    
11. # deb-src http://mirrors.163.com/ubuntu/ focal-backports main restricted universe multiverse
    
12. # 预发布软件源，不建议启用
    
13. # deb http://mirrors.163.com/ubuntu/ focal-proposed main restricted universe multiverse
    
14. # deb-src http://mirrors.163.com/ubuntu/ focal-proposed main restricted universe multiverse

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第三步：执行更新命令：

1. <p>sudo apt-get update</p><p>sudo apt-get upgrade</p>

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常用国内源：

阿里云源

1. deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
   
2. 
   
3. deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
   
4. 
   
5. deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
   
6. 
   
7. deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
   
8. 
   
9. deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
   
10. 
    
11. deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
    
12. 
    
13. deb http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
    
14. 
    
15. deb-src http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
    
16. 
    
17. deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
    
18. 
    
19. deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
    
20. 
    
21. 清华源
    
22. 
    
23. # 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
    
24. 
    
25. deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal main restricted universe multiverse
    
26. 
    
27. # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal main restricted universe multiverse
    
28. 
    
29. deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
    
30. 
    
31. # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
    
32. 
    
33. deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
    
34. 
    
35. # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
    
36. 
    
37. deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security main restricted universe multiverse
    
38. 
    
39. # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security main restricted universe multiverse
    
40. 
    
41. # 预发布软件源，不建议启用
    
42. 
    
43. # deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-proposed main restricted universe multiverse
    
44. 
    
45. # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-proposed main restricted universe multiverse
    
46. 
    
47. 中科大源
    
48. 
    
49. deb https://mirrors.ustc.edu.cn/ubuntu/ focal main restricted universe multiverse
    
50. 
    
51. deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal main restricted universe multiverse
    
52. 
    
53. deb https://mirrors.ustc.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
    
54. 
    
55. deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
    
56. 
    
57. deb https://mirrors.ustc.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
    
58. 
    
59. deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
    
60. 
    
61. deb https://mirrors.ustc.edu.cn/ubuntu/ focal-security main restricted universe multiverse
    
62. 
    
63. deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-security main restricted universe multiverse
    
64. 
    
65. deb https://mirrors.ustc.edu.cn/ubuntu/ focal-proposed main restricted universe multiverse
    
66. 
    
67. deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-proposed main restricted universe multiverse
    
68. 
    
69. 网易163源
    
70. 
    
71. deb http://mirrors.163.com/ubuntu/ focal main restricted universe multiverse
    
72. 
    
73. deb http://mirrors.163.com/ubuntu/ focal-security main restricted universe multiverse
    
74. 
    
75. deb http://mirrors.163.com/ubuntu/ focal-updates main restricted universe multiverse
    
76. 
    
77. deb http://mirrors.163.com/ubuntu/ focal-proposed main restricted universe multiverse
    
78. 
    
79. deb http://mirrors.163.com/ubuntu/ focal-backports main restricted universe multiverse
    
80. 
    
81. deb-src http://mirrors.163.com/ubuntu/ focal main restricted universe multiverse
    
82. 
    
83. deb-src http://mirrors.163.com/ubuntu/ focal-security main restricted universe multiverse
    
84. 
    
85. deb-src http://mirrors.163.com/ubuntu/ focal-updates main restricted universe multiverse
    
86. 
    
87. deb-src http://mirrors.163.com/ubuntu/ focal-proposed main restricted universe multiverse
    
88. 
    
89. deb-src http://mirrors.163.com/ubuntu/ focal-backports main restricted universe multiverse
    

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done!