I use nvidia optimus gt540m graphics card. Today I upgraded to 13.10 successfully and installed Bumblebee but because of the problems about using external screen, I removed it using
sudo apt-get install ppa-purge sudo ppa-purge ppa:bumblebee/stable
commands. After reboot, there was only black screen and a cursor after login even though login screen was still available. So, I installed
nvidia-current but that didn't solve problem. After that, I reinstalled compiz, I activated unity-plugin from compiz-config settings manager.
Now, after restarting several times, unity may work. Even if it works, in spite of that multiple workspaces are allowed and shortcuts are set, I cannot switch workspaces using these shortcuts( e.g. ctrl+ alt + left). I want to set Unity back to it's initial settings ,the ones I used when I installed Ubuntu. I don't know if I installed drivers properly too and Unity doesn't seem to be working correctly.
Thanks in advance.
Edit: I managed to reset unity and shortcuts seem to be working now. But still, when I login, I usually end up with a black screen and a cursor. I open unity from ctrl+alt+F1, some parts remain missing like panel at the top. Its possible that I have a problem with drivers