I recently bought a windows 8 pre-installed dell laptop.
I created a boot-able USB using LiLi bootable USB creator with 13.04 iso file for 64-bit (amd64) downloaded from ubuntu official site and installed 13.04 alonside windows 8.
I disabled secure boot and legacy boot.
Only UEFI was enabled.
At the end of installation I restarted my computer and ubuntu got stuck in the purple page for hours.
I had to later turn on the legacy boot ALSO to successfully login to ubuntu 13.04 and use it.
I updated 13.04 and upgraded it to 13.10 after a very long process and restarted my laptop as directed to start using 13.10. But as I boot into Ubuntu, I just get a black screen with a dialogue box saying "The system is running on low graphics" and that, I need to configure them manually.
There is only one option that says "OK". Then I get a black screen with commands running on it. I checked for graphic drivers for my AMD Radeon 8600 2Gb graphics. All the drivers were installed.
I even followed all the steps as suggested in the in the post titled "The greeter is invalid" under How to fix "The system is running in low-graphics mode" error? .
I then followed procedures as suggested in http://linuxg.net/fix-error-the-system-is-runnig-in-low-graphic-mode/ .
After which I followed 1, 2, 3 and 4th step of post titled "Issues with Nvidia or AMD/ATI graphics" under How to fix "The system is running in low-graphics mode" error? . And then i tried sudo apt-get install fglrx as given in 5th step of the same post in How to fix "The system is running in low-graphics mode" error? .
I rebooted and nothing happens. I even tried installing 13.10 using another bootable USB with the .iso file on it. But the same problem persists.
Please help me solve this problem.