while upgrading from Ubuntu 14.04 to 14.10 the computer crashed and I had to reboot when I entered Ubuntu I couldn't do a thing: the GUI wasn't working correctly actually when I enter my user name and password I enter to a blue screen.

what can I do to return my system ?

if there wasn't any solution except reintalling the system from a USB or a DVD so how can I make a backup from my apps in the old system?

  • Since you mentioned "blue screen" I assume you are running a dual-boot with Windows? – PJ Singh Oct 24 '14 at 20:29
  • yes I dual boot with windows – user3625569 Oct 25 '14 at 19:33
  • As you're a reputation 1 user: If the answer helped you, don't forget to click the grey at the left of this text, which means "yes, this answer is valid"! ;-) – Fabby Jun 1 '15 at 20:40

I had this issue too. To resolve I did the following.

  • Boot up ubuntu until you have the "blue screen"
  • Go into a text console using the key combo < Ctrl>< Alt>F1. You should see a user/password prompt
  • Log into the text console with your user account
  • Ensure package list is updated: sudo apt-get update
  • I got a message at the end saying configuration of packages was interrupted earlier, instructing me to do the following:sudo dpkg --configure -a
  • Now to complete, ensure package installation complete (this step might be superfluous): sudo apt-get install -f
  • Now remove packages which are no longer required: sudo apt-get autoremove
  • Now reboot: sudo reboot

Result: blue screen gone and can log in again.

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