[Bug 1795249] Re: upgrade from 16. to UBUNTU 18.04 successful until restart now - then failed to boot up.

[Geoffrey Woodman]

1. Samsung monitor problem overcome by Software & Updates -> additional drivers tab -> check NVIDIA driver instead of open source driver.
2. NVIDIA driver also corrects the permanent blobs problem noted above so "quiet splash" can be put back into the grub file.
3. Note also "acpi=off" stops the computer powering off when shutting down (manually use the front panel button when all activity has stopped) but this is a small price to pay for allowing the computer to boot up!

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https://bugs.launchpad.net/bugs/1795249

Title:
  upgrade from 16. to UBUNTU 18.04 successful until restart now - then
  failed to boot up.

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Upgrade from 16. (LTS) to UBUNTU 18.04 successful until restart now - then failed to boot up. acpi=off allows me to boot up. The 5 blobs on the splash screen were then permanent so switched off as: 
  sudo nano /etc/default/grub
  GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi=off"
  CTRL X, Y, Enter
  sudo update-grub

  I still have a problem that my SAMSUNG monitor is "unknown" and I
  don't know how to overcome this. It is now in a very strange aspect
  ratio.

  Not expecting these types of problems on an upgrade!!! It took hours
  of effort to work out how to get the computer to start up before I
  could edit the above file. I would have been completely stuck without
  access to an old Windows machine!!!

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.25
  ProcVersionSignature: Ubuntu 4.15.0-34.37-generic 4.15.18
  Uname: Linux 4.15.0-34-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.3
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Sep 30 17:02:03 2018
  InstallationDate: Installed on 2010-09-15 (2937 days ago)
  InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
  PackageArchitecture: all
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: dist-upgrade
  UpgradeStatus: Upgraded to bionic on 2018-09-27 (3 days ago)
  VarLogDistupgradeTermlog:

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