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它不起作用： sudo apt update

tag-icon • tag-icon boot networking kubuntu archive
它不起作用： sudo apt update 
Hit:1 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:2 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:3 http://security.ubuntu.com/ubuntu focal-security InRelease
Reading package lists... Done
Building dependency tree       
Reading state information... Done
All packages are up to date.

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