Looking at the log file we can see the following:
2018-05-21 09:55:56,514 DEBUG nvidiaUpdate()
2018-05-21 09:55:58,109 INFO no old nvidia driver installed, installing no new
Then looking at DistUpgradeCache from ubuntu-release-upgrader there is
this:
540 # get new detection module and use the modalises files
541 # from within the release-upgrader
542 nv = NvidiaDetection(obsolete="./ubuntu-drivers-obsolete.pkgs")
543 #nv = NvidiaDetection()
544 # check if a binary driver is installed now
545 for oldDriver in nv.oldPackages:
546 if oldDriver in self and self[oldDriver].is_installed:
547 self.mark_remove(oldDriver, "old nvidia driver")
548 break
549 else:
550 logging.info("no old nvidia driver installed, installing
no new")
551 return False
Unfortunately, the dist-upgrader tarball doesn't actually have "ubuntu-
drivers-obsolete.pkgs" in it so nv.oldPackages is always empty and no
old nvidia driver will be detected.
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https://bugs.launchpad.net/bugs/1773637
Title:
Distribution upgrade to 18.04: used nvidia display driver is commented
out
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https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-390/+bug/1773637/+subscriptions
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