I just performed a suggested update by the Update Manager on Ubuntu 14.04, and now I get no video when I reboot.
I get the splash screen, then it goes black.
Can I somehow switch back to default X drivers from terminal?
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Had the same problem today, here's what helped me:
mount -o remount rw /
apt-get remove --purge nvidia*
Now you are using open source Nouveau driver. If you wish, you can reenable Nvidia binary driver.
Reboot and enter into recovery mode By Pressing SHIFT Key
After reaching the menu choose drop to shell
Then execute the command
sudo mount -o remount rw /
Edit the file
# sudo gedit /etc/default/grub
And modify the line :
It to obtain this line :
GRUB_CMDLINE_LINUX_DEFAULT="acpi=noirq acpi=force apm=power_off quiet splash"
Then, save, close, and back in the terminal, execute :
# sudo update-grub
Now, when you will Shutdown, it should Work great.