need help..i get stucked in log in screen

Im new to kubuntu and using linux...everything runs smoothly until this morning i shutdown my laptop and when i came back when i login it always goes back to the log in screen..Please do help me..all my thesis files are in my laptop

need help..i get stucked in log in screen

There has been a kernel update. Your graphics will disappear and any special driver e.g. Nvidia, will go too. All is not lost. Log in with your username and password then issue the command "sudo dpkg-reconfigure xserver-xorg" (without the ""). This will start a text based program to reconfigure your graphics. Answer the questions you can. If there are questions you can't answer then go with the suggested default. If at first you don't succeed then try again and go for VESA. To restart use "sudo reboot". When you get it going you will need to reinstall any special graphics driver e.g. nvidia.