清除已卸载软件遗留配置

使用如下命令：

dpkg --get-selections |grep deinstall | sed 's/deinstall/\lpurge/' | sudo dpkg --set-selections; sudo dpkg -Pa

解释：

1、dpkg –get-selections显示标记为“deinstall”的包，显示结果

1. root@langchao-PC:~# dpkg --get-selections |grep deinstall
2. deepin-screen-recorder deinstall

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2、sed 's/deinstall/\lpurge/'的作用是将上面的输出deepin-screen-recorder deinstall修改为deepin-screen-recorder purge

2. root@langchao-PC:~# dpkg --get-selections |grep deinstall|sed 's/deinstall/\lpurge/'
3. deepin-screen-recorder purge

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3、dpkg --set-selections即将pkg包修改为purge

4、 dpkg -Pa的作用是将标记为purge的包的配置信息清除

-P, --purge package...|-a|--pending

Purge  an installed or already removed package. This removes everything, including conffiles, and anything else cleaned up from postrm.  If -a or --pending is given instead of  a  package name,   then   all   packages   unpacked  or  removed,  but  marked  to  be  purged  in  file /var/lib/dpkg/status, are purged.