Hi @Stephan van Ingen and all other impatient to wait for convenience (like me 
:). As I already noted above (comment #12) You can download the available buggy 
version (noted in same comment) and after that to correct and run it by hand. 
It needs a little change only in file 'DistUpgradeController.py'. One 
possibility is to prepend lines from 733 to 748 (inclusive) with 4 spaces for 
every one. I used this approach and can confirm - it works. Another possibility 
is to insert proposed by @Julian Andres Klode 2 lines just before line 733. I 
suppose this also work, but I have not checked it. Third possibility is to 
download fixed version of the archived tarball which I provide here. That is 
exact files I used for the upgrade. I use in the proposed tarball the first 
correction variant (You don't have to fix anything).
Does not matter what variant You choose, finally You should have a directory 
(created earlier with name of Your choice) where the unpacked and fixed files 
sits. It is time to open a terminal window.
Change Your current working directory with that (created early) where sits 
prepared files.
  cd place/of/prepared/files
!!!Note - It is important to be in exactly this directory! Otherwise incorrect 
library will be used.
There is file named 'artful'. This file represent actual upgrade application. 
You should run it in super user context with correct parameters. Something like:
  sudo ./artful --mode=server --frontend=DistUpgradeViewText
After entering Your password (need for 'sudo'), actual upgrade process will 
start (hopefully without issues). During upgrade, additional questions, related 
to upgrade process, can be set by application (in fact same like in graphical 
interface). Just answer, as appropriate, according to Your opinion.
That's all. I hope I have helped.

** Attachment added: "workaround.tar.gz"

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

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