** Also affects: apt (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1872557

Title:
  apt-get error: cnf-update-db - KeyError: 'suite' (focal)

Status in command-not-found:
  New
Status in apt package in Ubuntu:
  New

Bug description:
  "apt-get update" fails to run when command-not-found is installed on
  Ubuntu 20.04.

  To reproduce with Docker:
  docker pull ubuntu:20.04    # Pull latest Ubuntu 20.04 docker image
  docker run -it ubuntu:20.04 # Start an Ubuntu 20.04 docker container

  # Within the container run:
  apt-get update
  apt-get -yy dist-upgrade
  apt-get -yy install command-not-found
  exec bash      # Reload bash to load command-not-found
  apt-get update # Update command-not-found database

  Traceback (most recent call last):
    File "/usr/lib/cnf-update-db", line 26, in <module>
      col.create(db)
    File "/usr/lib/python3/dist-packages/CommandNotFound/db/creator.py", line 
93, in create
      self._fill_commands(con)
    File "/usr/lib/python3/dist-packages/CommandNotFound/db/creator.py", line 
127, in _fill_commands
      self._parse_single_commands_file(con, fp)
    File "/usr/lib/python3/dist-packages/CommandNotFound/db/creator.py", line 
165, in _parse_single_commands_file
      suite=tagf.section["suite"]
  KeyError: 'suite'
  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

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