1、新建文件/etc/apt/sources.list.d/software.list，添加如下内容

    1. sudo vi /etc/apt/sources.list.d/software.list
    2. deb http://archive.ubuntukylin.com/ubuntukylin focal-partner main

    2、添加apt key。

    1. sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 56583E647FFA7DE7

    3、运行命令apt update，更新列表

    1. sudo apt update

    4、安装微信

    1. sudo apt install weixin

    参考博客：https://blog.csdn.net/OTZ_2333/article/details/122368735?utm_medium=distribute.pc_relevant.none-task-blog-2~default~baidujs_baidulandingword~default-0.pc_relevant_paycolumn_v3&spm=1001.2101.3001.4242.1&utm_relevant_index=3