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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