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 InReleaseHit: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 DbCreatorModuleNotFoundError: No module named 'CommandNotFound'Reading packages list... DoneE: 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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