I have a system with a dual-boot of Windows 8.1 32-bit and Ubuntu 14.04 64-bit. Ubuntu usually works but after I became root with the command "sudo su" and rebooted my PC it had a Black screen after the Ubuntu logo with the dots goes off. I started Ubuntu's terminal so I can use it to start up Ubuntu but it don't know how. My graphics card is ATI Radeon 3100 Graphics. How do I start Ubuntu with terminal?
There are two ways to start your xsession from a text console like tty1 tty2 etc. I can only assume that is what you are referring to when you say terminal. If not, press CTRL + ALT + F2 and then sign in with your username and password.
Once you are signed in, type the following command:
sudo service lightdm start
sudo service lightdm restart
If you are using gnome you may need to use gdm instead of lightdm like this:
sudo service gdm start
Alternatively, you can start the xsession without a display manager. You can use this command to start the xsession and default desktop:
Please post any errors to receive further assistance.
I really don't see how sudo su would cause the problem you are experiencing unless it has to do with one of the commands you entered after becoming root.
how do I tell if i'm using gnome? Aug 2, 2014 at 4:33
lightdmcommand will output something like "lightdm: unrecognized service"– mchidAug 2, 2014 at 4:38