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

[Seb]

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

[Seb (sebbo)]

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

[Seb (sebbo)]

I now suspect it is a FGLX problem.
Anybody an idea what I could do to fix?
Conky has now windowed wigdets?
System is not so fast.
How can I check what went wrong and how to solve.
Can provide logs now.

[Brian Murray (brian-murray)]

Thank you for taking the time to report this issue and helping to make Ubuntu better. Examining the information you have given us, this does not appear to be a bug report so we are closing it and converting it to a question in the support tracker. We appreciate the difficulties you are facing, but it would make more sense to raise problems you are having in the support tracker at https://answers.launchpad.net/ubuntu if you are uncertain if they are bugs. For help on reporting bugs, see https://help.ubuntu.com/community/ReportingBugs#When%20not%20to%20file%20a%20bug.