Forever Learner's questions

I am facing “The system is running in low-graphics mode” error on my Dell XPS M 1530 dual boot laptop. I referred How to fix "The system is running in low-graphics mode" error? but not able to fix the problem yet.

I tried

sudo apt-get install --reinstall ubuntu-desktop
sudo reboot

I also verified that greeter is valid.

greeter-session=unity-greeter 

I installed the nvidia driver

sudo apt-get install nvidia-current - More stable/tested version sudo apt-get install nvidia-current-updates - More up-to-date version

Still when I tried to reboot in safe mode it did not help.

if I run startx from command line I see the error Module Nvidia_173 not found. No screens found.

Any thoughts on how can I fix this. Thanks.

Edit: @private: could you please tell how can I verify if nvidia has optimus or not.

I want to change Key short cut to Super+L for LockScreen but it is not working. If I try any other combination like CTRL+ALT+L or CTRL+ALT+G , it works. Win+L combination used to work in 11.10.

If I hover over to the setting menu or any of the indicator menus, Prnt Scrnbutton won't work.

If I want to take the snapshot of these menus, how do I do that?

I tried the combination CTRL+ALT+L or L but it is not working. But if I select the menu item Lock screen from the Setting drop down it works.

Any thoughts on how to fix keyboard shortcut?