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Ubuntu 18.04 中 sudo apt update 的问题：如果 /usr/bin/test -w /var/lib/command-not-found/ 调用后成功

使用sudo apt update.

Hit:1 http://it.archive.ubuntu.com/ubuntu bionic InRelease
Hit:2 http://it.archive.ubuntu.com/ubuntu bionic-updates InRelease                                                                                       
Hit:3 http://it.archive.ubuntu.com/ubuntu bionic-backports InRelease                                                                                     
Hit:4 http://security.ubuntu.com/ubuntu bionic-security InRelease                                     
Hit:5 http://archive.canonical.com/ubuntu bionic InRelease                
Traceback (most recent call last):                    
  File "/usr/lib/cnf-update-db", line 8, in <module>
    from CommandNotFound.db.creator import DbCreator
ModuleNotFoundError: No module named 'CommandNotFound'
Reading packages list... Done
E: Problem executing scripts APT::Update::Post-Invoke-Success   
 'if /usr/bin/test -w /var/lib/command-not-found/ -a -e /usr/lib/cnf-update-db;     
 then /usr/lib/cnf-update-db > /dev/null; fi'  
E: Sub-process returned an error code

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这些是结果 sudo apt install --reinstall command-not-found