[Bug 1509383] Re: Distro upgrade from 15.04 to 15.10 completely failed. System is not accesable, blanc screen

[Seb]

Finaly managed to get into system via the old 3.19 kernel (pressing
shift during boot).

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https://bugs.launchpad.net/bugs/1509383

Title:
  Distro upgrade from 15.04 to 15.10 completely failed. System is not
  accesable, blanc screen

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

Bug description:
  During the Upgrade to 15.10 my PC froze with only the wallpaper on the screen. No Unity or so.
  Also was there no HDD activity for over an hour.
  I rebooted and the system came back partly showing 15.10 but login stated 15.04 and the kernel was still 3.19.
  After using the following commands:

  sudo apt-get update && apt-get distro-upgrade the system complained
  that something was wrong and advised dpkg -a or something to repair
  broken packages.

  then it went on updating everything but not cleaning up. Have now 30Gig extra on HDD or so.
  After reboot the system seems to boot but goes to blanc screen.
  NumLock and Caps lock do not respond.
  ALT+CTRL+F1 or F2 are not available.

  Please advice?
  Do I need to reinstall the system?
  Cannot deliver any logs or so as the system is not accessible at the moment.
  Am downloading the live CD to gain access to the system.
  Thanks in advance

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