so I installed a 2nd graphic card, installed the proprietary driver for it (nvidia quadro), but now when I boot the computer, the purple screen loads for a while and then all I get it's a black screen with a blinking cursor.
I've taken the 2nd card out but it doesn't change anything.

I am preparing a usb stick to boot from it and try to access my system: is there anything I can do to fix this?

it's a ubuntu 13.10 64 bits


sorry, I found out shortly after posting, thanks to this answer:

  1. enter recovery mode (keep left shift pressed, after BIOS is loaded, or ctrl+alt+F1 from black screen and sudo su)
  2. apt-get remove --purge nvidia*
  3. shutdown -r now

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