After upgrading Ubuntu 12.04 appears "Ubuntu is running in low-graphics mode? " ", unable to enter the graphical interface, and gave some options, found that the other few are useless, and eventually can only use low-graphics Access, but the system is still not in, the following is the solution:
First ctrl+alt+f1(~F6) into the terminal, and then log on the user ;
Then do the following steps
sudo apt-get update
sudo apt-get-d install--reinstall GDM
sudo apt-get remove--purge GDM
Execute sudo apt-get install GDM again
Prompt to choose GDM during installation
Then sudo reboot
You can enter the graphical interface after rebooting, but the effect is not as good as before.
================================================================================
Also found VirtualBox virtual hard disk space to run out, so will VirtualBox The installation directory D:\Program files\oracle\ The VirtualBox is added to the system environment variable.
Then, in cmd , go to ubuntu1204.vdi 's storage path C:\Users\Turing\VirtualBox vms\ubuntu1204, execute the command vboxmanage MODIFYHD Ubuntu1204.vdi--resize 20000
The expansion is complete!
Http://blog.sina.com.cn/s/blog_6696b96901015sgu.html
Ubuntu does not have access to the graphical interface and VirtualBox expansion solutions