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Ubuntu 20.04.1 LTS sudo apt-get update 错误

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Ubuntu 20.04.1 LTS sudo apt-get update 错误 
Hit:1 http://dl.google.com/linux/chrome/deb stable InRelease
Err:2 http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu focal InRelease                              
  Connection failed [IP: 91.189.95.83 80]
Hit:3 https://download.sublimetext.com apt/stable/ InRelease                                                
Err:4 http://ubuntutym.u-toyama.ac.jp/ubuntu focal InRelease                                       
  Connection failed [IP: 160.26.2.187 80]
Err:5 http://ubuntutym.u-toyama.ac.jp/ubuntu focal-updates InRelease
  Connection failed [IP: 160.26.2.187 80]
Err:6 http://ubuntutym.u-toyama.ac.jp/ubuntu focal-backports InRelease
  Connection failed [IP: 160.26.2.187 80]
Err:7 http://ubuntutym.u-toyama.ac.jp/ubuntu focal-security InRelease
  Connection failed [IP: 160.26.2.187 80]
Reading package lists... Done                             
W: Failed to fetch http://ubuntutym.u-toyama.ac.jp/ubuntu/dists/focal/InRelease  Connection failed [IP: 160.26.2.187 80]

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