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Ubuntu软件包更新

当使用sudo apt update来更新软件时,报了这些错误。

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

按提示安装command-not-found sudo apt install --reinstall command-not-found

Reading package lists... Done 
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
Need to get 0 B/5.188 B of archives
After this operation, 0 B of additional disk space will be used.
(Reading the database ... 225797 files and directories currently installed.)
Preparations for extracting ... / command-not-found_18.04.4_all.deb ...
Extracting command-not-found (18.04.4) on (18.04.4) ...
Configuring command-not-found (18.04.4) ...
libdvd-pkg: Package libdvdcss2-1.4.2-1 was removed, stop processing...

当我在重新安装完command-not-found之后,再次尝试sudo apt update时,结果还是一样。

解决方案
sudo find / -name 'CommandNotFound'
sudo cp -r /path/of/CommandNotFound /usr/lib/

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