This only affects the DistUpgradeViewText frontend and the source of the
problem seems to be the logfile for screen.

screenrc contains "/var/log/dist-upgrade/screenlog.%n"

and

DistUpgradeMain.py calls screen with "-L" but no log file name.  I'm
pretty sure this used to work on upgrades from Y to Z. While passing the
log file name to the -L switch works, there may be a better solution
e.g. making sure screenrc is sourced or finding out if there is a bug in
screen.

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https://bugs.launchpad.net/bugs/1686117

Title:
  upgrade from Zesty to Artful fails

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