我要评论问题一：ubuntu20.04安装vim时提示“e: 软件包 vim 没有可安装候选”
**解决：**更换下载，比如我原先使用的是清华源，后切换成阿里云源，ubuntu直接在“软件和更新”切换
问题一解决。
问题二：ubuntu20.04提示“w: 目标 sources (main/source/sources) 在 /etc/apt/sources.list:2 和 /etc/apt/sources.list:7 中被配置了多次”
**解决：**直接更新下载源：sudo apt upgrade
问题二解决。
运行log：
h@h-virtual-machine:~/work$ sudo apt install vim
[sudo] h 的密码：
正在读取软件包列表... 完成
正在分析软件包的依赖关系树
正在读取状态信息... 完成
没有可用的软件包 vim，但是它被其它的软件包引用了。
这可能意味着这个缺失的软件包可能已被废弃，
或者只能在其他发布源中找到
w: 目标 sources (main/source/sources) 在 /etc/apt/sources.list:2 和 /etc/apt/sources.list:7 中被配置了多次
e: 软件包 vim 没有可安装候选
h@h-virtual-machine:~/work$ sudo apt update
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忽略:121 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-security/universe amd64 packages
忽略:122 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-security/universe i386 packages
忽略:123 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-security/multiverse amd64 packages
忽略:124 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-security/multiverse i386 packages
忽略:38 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal/main i386 packages
忽略:45 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal/restricted i386 packages
忽略:46 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal/restricted amd64 packages
忽略:47 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal/universe i386 packages
忽略:48 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal/universe amd64 packages
忽略:49 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal/multiverse amd64 packages
忽略:50 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal/multiverse i386 packages
忽略:67 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-updates/main amd64 packages
忽略:68 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-updates/main i386 packages
忽略:69 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-updates/restricted amd64 packages
忽略:70 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-updates/restricted i386 packages
忽略:85 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-updates/universe i386 packages
忽略:88 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-updates/universe amd64 packages
忽略:91 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-updates/multiverse amd64 packages
忽略:98 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-updates/multiverse i386 packages
忽略:99 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-backports/main i386 packages
忽略:100 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-backports/main amd64 packages
忽略:101 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-backports/universe amd64 packages
忽略:110 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-backports/universe i386 packages
错误:9 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal/main amd64 packages
404 not found [ip: 101.6.15.130 443]
忽略:111 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-security/main i386 packages
忽略:112 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-security/main amd64 packages
忽略:113 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-security/restricted amd64 packages
忽略:114 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-security/restricted i386 packages
忽略:121 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-security/universe amd64 packages
忽略:122 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-security/universe i386 packages
忽略:123 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-security/multiverse amd64 packages
忽略:124 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-security/multiverse i386 packages
忽略:38 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal/main i386 packages
忽略:45 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal/restricted i386 packages
错误:67 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-updates/main amd64 packages
404 not found [ip: 101.6.15.130 443]
忽略:68 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-updates/main i386 packages
忽略:69 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-updates/restricted amd64 packages
忽略:70 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-updates/restricted i386 packages
忽略:85 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-updates/universe i386 packages
忽略:88 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-updates/universe amd64 packages
忽略:91 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-updates/multiverse amd64 packages
忽略:98 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-updates/multiverse i386 packages
错误:99 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-backports/main i386 packages
404 not found [ip: 101.6.15.130 443]
忽略:100 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-backports/main amd64 packages
忽略:101 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-backports/universe amd64 packages
忽略:110 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-backports/universe i386 packages
错误:111 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-security/main i386 packages
404 not found [ip: 101.6.15.130 443]
忽略:112 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-security/main amd64 packages
忽略:113 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-security/restricted amd64 packages
忽略:114 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-security/restricted i386 packages
忽略:121 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-security/universe amd64 packages
忽略:122 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-security/universe i386 packages
忽略:123 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-security/multiverse amd64 packages
忽略:124 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports focal-security/multiverse i386 packages
正在读取软件包列表... 完成
w: 目标 sources (main/source/sources) 在 /etc/apt/sources.list:2 和 /etc/apt/sources.list:7 中被配置了多次
e: 无法下载 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/dists/focal/main/binary-amd64/packages 404 not found [ip: 101.6.15.130 443]
e: 无法下载 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/dists/focal-updates/main/binary-amd64/packages 404 not found [ip: 101.6.15.130 443]
e: 无法下载 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/dists/focal-backports/main/binary-i386/packages 404 not found [ip: 101.6.15.130 443]
e: 无法下载 https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/dists/focal-security/main/binary-i386/packages 404 not found [ip: 101.6.15.130 443]
e: 部分索引文件下载失败。如果忽略它们，那将转而使用旧的索引文件。
w: 目标 sources (main/source/sources) 在 /etc/apt/sources.list:2 和 /etc/apt/sources.list:7 中被配置了多次
h@h-virtual-machine:~/work$ sudo apt upgrad
e: 无效的操作 upgrad
h@h-virtual-machine:~/work$ sudo apt upgrade
正在读取软件包列表... 完成
正在分析软件包的依赖关系树
正在读取状态信息... 完成
正在计算更新... 完成
升级了 0 个软件包，新安装了 0 个软件包，要卸载 0 个软件包，有 0 个软件包未被升级。
h@h-virtual-machine:~/work$ sudo apt install vim
正在读取软件包列表... 完成
正在分析软件包的依赖关系树
正在读取状态信息... 完成
没有可用的软件包 vim，但是它被其它的软件包引用了。
这可能意味着这个缺失的软件包可能已被废弃，
或者只能在其他发布源中找到
e: 软件包 vim 没有可安装候选
h@h-virtual-machine:~/work$ sudo apt install vim
正在读取软件包列表... 完成
正在分析软件包的依赖关系树
正在读取状态信息... 完成
将会同时安装下列软件：
vim-common vim-runtime vim-tiny
建议安装：
ctags vim-doc vim-scripts indent
下列【新】软件包将被安装：
vim vim-runtime
下列软件包将被升级：
vim-common vim-tiny
升级了 2 个软件包，新安装了 2 个软件包，要卸载 0 个软件包，有 286 个软件包未被升级。
需要下载 7,121 kb/7,791 kb 的归档。
解压缩后会消耗 34.6 mb 的额外空间。
您希望继续执行吗？ [y/n] y
获取:1 http://mirrors.aliyun.com/ubuntu focal-updates/main amd64 vim-runtime all 2:8.1.2269-1ubuntu5.21 [5,878 kb]
获取:2 http://mirrors.aliyun.com/ubuntu focal-updates/main amd64 vim amd64 2:8.1.2269-1ubuntu5.21 [1,243 kb]
已下载 7,121 kb，耗时 1秒 (5,337 kb/s)
(正在读取数据库 ... 系统当前共安装有 183746 个文件和目录。)
准备解压 .../vim-tiny_2%3a8.1.2269-1ubuntu5.21_amd64.deb ...
正在解压 vim-tiny (2:8.1.2269-1ubuntu5.21) 并覆盖 (2:8.1.2269-1ubuntu5.11)
...
准备解压 .../vim-common_2%3a8.1.2269-1ubuntu5.21_all.deb ...
正在解压 vim-common (2:8.1.2269-1ubuntu5.21) 并覆盖 (2:8.1.2269-1ubuntu5.1
1) ...
正在选中未选择的软件包 vim-runtime。
准备解压 .../vim-runtime_2%3a8.1.2269-1ubuntu5.21_all.deb ...
正在添加 通过 vim-runtime 从 /usr/share/vim/vim81/doc/help.txt 到 /usr/sha
re/vim/vim81/doc/help.txt.vim-tiny 的转移
正在添加 通过 vim-runtime 从 /usr/share/vim/vim81/doc/tags 到 /usr/share/v
im/vim81/doc/tags.vim-tiny 的转移
正在解压 vim-runtime (2:8.1.2269-1ubuntu5.21) ...
正在选中未选择的软件包 vim。
准备解压 .../vim_2%3a8.1.2269-1ubuntu5.21_amd64.deb ...
正在解压 vim (2:8.1.2269-1ubuntu5.21) ...
正在设置 vim-common (2:8.1.2269-1ubuntu5.21) ...
正在设置 vim-runtime (2:8.1.2269-1ubuntu5.21) ...
正在设置 vim (2:8.1.2269-1ubuntu5.21) ...
update-alternatives: 使用 /usr/bin/vim.basic 来在自动模式中提供 /usr/bin/v
im (vim)
update-alternatives: 使用 /usr/bin/vim.basic 来在自动模式中提供 /usr/bin/v
imdiff (vimdiff)
update-alternatives: 使用 /usr/bin/vim.basic 来在自动模式中提供 /usr/bin/r
vim (rvim)
update-alternatives: 使用 /usr/bin/vim.basic 来在自动模式中提供 /usr/bin/r
view (rview)
update-alternatives: 使用 /usr/bin/vim.basic 来在自动模式中提供 /usr/bin/v
i (vi)
update-alternatives: 使用 /usr/bin/vim.basic 来在自动模式中提供 /usr/bin/v
iew (view)
update-alternatives: 使用 /usr/bin/vim.basic 来在自动模式中提供 /usr/bin/e
x (ex)
正在设置 vim-tiny (2:8.1.2269-1ubuntu5.21) ...
正在处理用于 desktop-file-utils (0.24-1ubuntu3) 的触发器 ...
正在处理用于 mime-support (3.64ubuntu1) 的触发器 ...
正在处理用于 hicolor-icon-theme (0.17-2) 的触发器 ...
正在处理用于 gnome-menus (3.36.0-1ubuntu1) 的触发器 ...
正在处理用于 man-db (2.9.1-1) 的触发器 ...
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