How to shutdown X Server

[Bumpalot]

Using kubuntu 12.10 & Desktop. My Nvidia GForce 550 Ti install isis acting up & I want to reinstall it.
To do this I need to shut down the X Server. How can I do this?

[HalationEffect]

First log out of KDE. At the login screen, hit CTRL ALT F1 to switch to TTY1 and login to your user account in text mode.

Now you can enter:

sudo service lightdm stop

That command will shut down the X server so that you can run the Nvidia install script.

[Bumpalot]

Thanks a bunch!!

[Bumpalot]

Followed your instructions - am left with terminal command. How do I get back into kubuntu from there??

[HalationEffect]

Followed your instructions - am left with terminal command. How do I get back into kubuntu from there??

Because you've updated a kernel driver, I'd recommend rebooting - just type the command sudo reboot into the terminal. Assuming all went well with the driver installation, you should boot back up to your usual GUI desktop environment.

[Bumpalot]

I did not update anything!!
Here's a recap of what I did:
First logged out of KDE. At the login screen, hit CTRL ALT F1 to switch to TTY1
Code:
sudo service lightdm stop
At command prompt:
cd Downloads
NVIDIA-Linux-x86_64-310.40.run --uninstall (as per NVIDIA-Linux-x86_64-310.40.run documentation)
Result: NVIDIA-Linux-x86_64-310.40.run - command not found
Restarted kubuntu.
Deleted NVIDIA-Linux-x86_64-310.40.run
Re downloaded NVIDIA-Linux-x86_64-310.40.run from NVIDIA site
Rebooted & repeated all the same steps as previous.
Got same results!!
What am I missing here??

[oshunluvr]

Did you set the .run file as executable? Also, the command to run a file like that is to precede the filename with a ./ or a sh - so try these commands:

chmod a+x NVIDIA-Linux-x86_64-310.40.run
sudo sh NVIDIA-Linux-x86_64-310.40.run --uninstall