升级到20.04 LTS后,apt-get更新失败

我正在尝试从18.04升级到20.04:

$ grep -i rel /etc/lsb-release 
DISTRIB_RELEASE=20.04

似乎存在依赖性问题:

$ sudo apt-get update
Hit:1 http://no.archive.ubuntu.com/ubuntu focal InRelease
Hit:2 http://no.archive.ubuntu.com/ubuntu focal-updates InRelease       
Hit:3 http://no.archive.ubuntu.com/ubuntu focal-backports InRelease     
Hit:4 http://security.ubuntu.com/ubuntu focal-security InRelease
Traceback (most recent call last):                
  File "/usr/lib/cnf-update-db", line 8, in <module>
    from CommandNotFound.db.creator import DbCreator
  File "/usr/lib/python3/dist-packages/CommandNotFound/db/creator.py", line 11, in <module>
    import apt_pkg
ImportError: libapt-pkg.so.6.0: cannot open shared object file: No such file or directory
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in apport_excepthook
    from apport.fileutils import likely_packaged, get_recent_crashes
  File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in <module>
    from apport.report import Report
  File "/usr/lib/python3/dist-packages/apport/report.py", line 30, in <module>
    import apport.fileutils
  File "/usr/lib/python3/dist-packages/apport/fileutils.py", line 23, in <module>
    from apport.packaging_impl import impl as packaging
  File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 24, in <module>
    import apt
  File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in <module>
    import apt_pkg
ImportError: libapt-pkg.so.6.0: cannot open shared object file: No such file or directory

Original exception was:
Traceback (most recent call last):
  File "/usr/lib/cnf-update-db", line 8, in <module>
    from CommandNotFound.db.creator import DbCreator
  File "/usr/lib/python3/dist-packages/CommandNotFound/db/creator.py", line 11, in <module>
    import apt_pkg
ImportError: libapt-pkg.so.6.0: cannot open shared object file: No such file or directory
Reading package lists... 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

有关如何维修的任何提示?

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