When I download updates for my nvidia geforce 8800gt, the screen turns black and the cursor is blinking at the top left corner. I am forced to reinstall ubuntu. Is it possible to run terminal before I boot ubuntu?
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you can try to hit CTRL+ALT+F2 to access a terminal. See also this question about TTY – Wayne_Yux Oct 14 '15 at 17:06
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There is something known as root recovery shell. You can access it through grub boot menu -> Advanced options for Ubuntu -> select one that says (recovery mode). You will have several options there, choose root shell. The filesystem in root shell is mounted read-only, so you will need to remount it with read write permissions with mount / -o remount,rw
Another small hack is to press e on the boot menu and add init=/bin/bash line , but I wouldn't recomment it.
Sergiy Kolodyazhnyy
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Thank you for the information, but it does not help. I try to remove the drivers but the Terminal says there are not installed. The blinking is still there, usually it turns orange. Also, if I remove the graphic card, Ubuntu loads normally. – steeef Oct 15 '15 at 07:59