This bug was fixed in the package cups - 2.2.7-1ubuntu2.4
--------------- cups (2.2.7-1ubuntu2.4) bionic; urgency=medium
* fix-a-parsing-bug-in-the-new-authentication-code.patch, fix-cups-auth-find-for-schemes-without-parameters.patch: Backported authentication fixes from upstream (LP: #1783298).
-- Till Kamppeter <email address hidden> Sun, 3 Mar 2019 12:28:01 +0100
This bug was fixed in the package cups - 2.2.7-1ubuntu2.4
---------------
cups (2.2.7-1ubuntu2.4) bionic; urgency=medium
* fix-a-parsing- bug-in- the-new- authentication- code.patch, cups-auth- find-for- schemes- without- parameters. patch: Backported
fix-
authentication fixes from upstream (LP: #1783298).
-- Till Kamppeter <email address hidden> Sun, 3 Mar 2019 12:28:01 +0100