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I have upgraded ubuntu from 14.04 to 15.04 by update-manager. After that ubuntu does not work anymore. It gives just dark screen and nothing more. So I can't use anything in ubuntu . can anyone help me? I can't log in and I don't have usb or cd because I used update-manager to upgrade

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    There is no official supported way to upgrade 14.04 to 15.04. You did it at your own risk. I suggest a fresh install of 14.04 or 15.04.
    – Pilot6
    Oct 17, 2015 at 13:15
  • what I have to do exactly, please. I have no experience with linux!
    – Abuzer Alhamza
    Oct 17, 2015 at 13:26
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    Exactly. Re-install Ubuntu.
    – Pilot6
    Oct 17, 2015 at 13:37

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Go to the recovery menu during boot:

Press the F8 key during boot right after the PC bios have loaded (try it a couple of time if you can't get into the recovery menu).

Hereafter will you be presented with a boot menu where you can go to recovery mode.

When booted up in recovery menu there is an option to start a root shell.

In the root shell you can start to diagnostic problems.

First look in /var/log/syslog or /var/log/syslog. to find problems.

$ less /var/log/syslog

Also look in /var/log/dmesg and /var/log/sddm.log

$ less /var/log/dmesg

To quit less type q key on the keyboard.

If you are using a newer NVidia graphic card (GTX970 or GTX980) you will have to install the xorg-edgers driver for the graphic card.

The can be done from recovery root shell as well.

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  • Maby he'll find some clues, but is seems to complex for OP to fix those problems, hence his commentary ("what I have to do exactly, please. I have no experience with linux!")
    – Promille
    Oct 17, 2015 at 14:42

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