Comment 5 for bug 1982420

Here's the core20 [ focal ] sample snapcraft config:

package-repositories:
  - type: apt
    formats:
      - deb
    url: 'http://archive.ubuntu.com/ubuntu'
    key-id: 843938DF228D22F7B3742BC0D94AA3F0EFE21092
    suites:
      - focal-backports
    components:
      - main
      - restricted
      - universe
      - multiverse