This bug was fixed in the package ubuntu-release-upgrader - 1:20.04.8

---------------
ubuntu-release-upgrader (1:20.04.8) focal; urgency=medium

  [ Jean-Baptiste Lallement ]
  * Do not install a snap package if the corresponding debian package is not
    installed (LP: #1856996)
  * Fixed crash when checking a section of a package when the package is a
    snap (LP: #1856862)
  * Update release to 20.04 in UI (LP: #1856948)

  [ Brian Murray ]
  * Translations, demotions and mirror updates.

 -- Brian Murray <[email protected]>  Fri, 20 Dec 2019 13:14:26 -0800

** Changed in: ubuntu-release-upgrader (Ubuntu Focal)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1856862

Title:
  Upgrade to focal fails with AttributeError: 'NoneType' object has no
  attribute 'section' in  in DistUpgradeCache.py line 942 when default
  snap packages are not installed

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