This bug was fixed in the package update-manager - 1:20.04.5
--------------- update-manager (1:20.04.5) focal; urgency=medium
* Fix TypeError crash in update() (LP: #1871490).
-- Marcus Tomlinson <email address hidden> Wed, 08 Apr 2020 17:59:48 +0100
This bug was fixed in the package update-manager - 1:20.04.5
---------------
update-manager (1:20.04.5) focal; urgency=medium
* Fix TypeError crash in update() (LP: #1871490).
-- Marcus Tomlinson <email address hidden> Wed, 08 Apr 2020 17:59:48 +0100