I can confirm that

do-release-upgrade --proposed

successfully works around this issue on the user end.  I am doing the
upgrade now. (I also added -f DistUpgradeViewGtk3 to it because I assume
the KDE UI still has broken autoscrolling in the terminal)

If anything can be done to get the fix to the main repo faster, I hope
this confirmation helps.

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  Unknown bad source brings up during 'zesty' to 'artful' upgrade and It
  break the process

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