I'm a new user of the Linux environment. I have just have installed Ubuntu 11.10 on my system and I'm unable to see the disk partition in which I have installed the OS.
Size of the main disk is 100 GB and I want to see it back so that I can save my data in it. Please help. The disk format is ext4.

df -h; mount; sudo fdisk -l; sudo parted -lYou may be prompted for your password. As you enter it, you won't see any placeholder characters (like *). That's OK--just type it in and press enter. Then select all the text in the Terminal (Edit > Select All), copy it to the clipboard (Edit > Copy), and paste it into your question or into a reply comment. – Eliah Kagan Nov 6 '11 at 16:07