I am new to linux/ ubuntu and just downloaded the v11 of ubuntu to learn linux. I faced this "No root file system is defined" error while trying to install it. This is how I was proceeding -

1. Downloaded ubuntu v11 from the ubuntu.com website, wrote the iso into a bootable cd, and then got into the linux installation process on restarting; everything fine till here.




2. In one of the screen during installation, there are three choices - install alongside windows, something else etc.. Since I have windows 7 in the C drive, I selected the first option - "Install alongside another OS".

Let me interrupt here to give my existing system details - HardDisk
size: 640GB. Number of existing partitions - 5 C drive - label
windows - 160GB - has windows 7 installed D drive - label linux -
160GB - does not have any data E drive - label backup - 100GB - has
some data F drive - label entertainment - 100GB - has some data G
drive - label work - 90GB - has some data All of the above are in
NTFS format.

3. In the screen that follows, an image is shown with 2 parts and each part is shown to have size equal to 80GB. There is a horizontal slider in the middle of these two images, with which I can resize the partitions. The right side partition is labeled Linux.
   There is also an option to do 'advanced partitions'.




4. On clicking advanced partitions on the above screen, a new screen is shown in which the partitions existing in my computer are shown - but the labels are different. I see that there are two partitions with size = 160GB each (as expected), and so I assumed that the first 160GB would be my existing C drive and the second on would be the partition which I had labeled as linux (drive D). So I selected the linux partition and clicked on proceed/ install now, and then this error was shown -
   "No root file system defined".. and I cannot proceed after this.

Please let me know two things here:

1. During the screen in point number 3 above, the image with slider was shown. Which partition (drive c: or d: or anyother) is being referred to here? Which one am I actually resizing - is it the existing c: drive which has windows 7 installed already, that is getting shrunk and then ubuntu getting installed in the remaining space?




2. What does ""No root file system defined" error mean? How do I select the proper partition and continue with the installation?

P.S.:

I had already partitioned my drives as mentioned above, and the D drive with 160GB was specifically left free for installing ubuntu. I would like to Select D drive during setup and install ubuntu here, while still keeping the already installed windows7 in C drive.

Thanks!