This problem might be occurring because of the graphic driver. So you must first get into your liveUSB session(i.e "Try Ubuntu without installing") with nomodeset
enabled.
Step 1 - Enable nomodeset
:-
- Start the liveUSB session.
- Then open GRUB(by pressing Shift key before the violet splash screen).
- Then select a kernel and press e to edit it. Now in it find the line that ends with
quiet splash
and add the words nomodeset
before it so that it is nomodeset quiet splash
- Now reboot. You must be able to enter into LiveUSB session without the 'low graphics' error.
Step 2 - Setting up persistence:-
Now you must consider using proprietary graphic drivers(i.e graphic driver provided by AMD) instead of the default open source driver. I am telling this because you are trying to install Ubuntu alongside windows 8 here and so when you run boot-repair
, after installing Ubuntu so that it gets detected by GRUB, you may face the "System running in legacy mode" error(since you have enabled nomodeset
) if you don't install the proprietary driver.(I am just guessing here. that is, I am not so sure if the *legacy mode* error is associated with
nomodeset. I need some comments on this below.)
But since you are in the liveUSB mode if you install the driver and reboot(so that the driver might work) you won't get the driver working, as you haven't set up any persistence. So the next thing you must do is to set up persistence. I will explain how to do this below:
- First, partition your USB device into two partitions from your Windows OS. Keep at least a 1 GB or so partition for the Ubuntu installation files(make this a FAT32 partition). Make another ext4(or ext2 or ext3) partition of the remaining space and remember to name it
casper-rw
(It is highly essential to name it so.). Use a GParted Live CD for this purpose(or any other partitioning software you like. I am recommending this because it worked for me). I am providing a few screen shots below(but these are not of the Gparted Live CD, I used):-
(Creating the FAT32 partition mentioned below)
(Creating the casper-rw
(ext4) partition)

(How it looks after partitioning)

- Now put the installation files into the FAT32 partition. For this you must use UNetbootin. See the screen shot below of UNetbootin :-
Carefully note what all I have selected and select exactly the same in your UNetbootin too(except for selecting Ubuntu 14.04 64-bit image! You have to select your 12.04 image). Also compare this image with the image before it. I have selected /dev/sdb1
since that is my FAT32 partition. You should select the FAT32 partition, accordingly in your PC.
Now, after the UNetbootin process is over, get into the FAT32 partition and delete the file(not the folder) named casper-rw
so that Ubuntu will use the casper-rw
partition instead of that file to store your data. It will be around 10MB (as we selected in UNetbootin).
Now get into liveUSB mode. Make some file in the desktop and then reboot. You must see the file that you created before(If not then persistence is not working).
Now you have successfully created a live USB with persistence! Just boot in with the USB device and select 'Try ubuntu without installing'.
Now that we have created a liveUSB session with persistence we can install AMD driver.
Step 3 - Installing AMD driver :-
- Now get into the liveUSB sessiom. Connect to the internet. Now press Ctrl+Alt+t to open a terminal. There type:-
sudo apt-get update && sudo apt-get upgrade
- After the updating process is over(which is achieved by the immediately above command) type:
sudo apt-get install fglrx fglrx-amdcccle
to install your graphic driver.
sudo reboot
- Now get into the liveUSB session again. Type in the terminal:-
fglrx
This must clearly show the details of your graphic card(If it doesn't you haven't installed the driver properly).
Install Ubuntu(see the last entry in the PS section below) and enjoy now!!
PS :-
- Credits for Step 1 go to this answer. Refer it for some extra info on step 1 .
- Credits for step 2 go to this answer. Refer it for more info on step 2.
- You can refer to the answer here for more info on step 3. Also if you want a "GUI" way to install your driver you can look at the answer mentioned for 14.04 in the same link.(IMO it must work for 12.04 too).
- To install Ubuntu alongside windows 8, you should follow the answer here. It must work. (Note that installing Ubuntu alongside Windows 8 is quite a difficult task as Windows 8 made it so. Therefore follow all the steps in that answer carefully)
I had the exactly same problem.
Disabling Fast Boot AND CSM got me throught the to the installation.
Without Fast Boot I got to the loading screen, but then it got stuck. I read this and as far as I understand, CSM allows non-UEFI installations. Since I have Windows 10 already installed and booting fro UEFI and want a dual boot, I tried disabling CSM et voilà, I am installing ubuntu 15.10 on my ASUS N552VX as we speak.
Hope it works for you too.
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