ok so i've been reading some of the threads related to this issue, but i can't find a solution. i'm also very new to linux.
the situation: i used to have windows 7 on my hp and had a dual boot with ubuntu. i didnt want windows so when i booted the ubuntu installation from my usb, i installed it and everyting worked fine. somehow something went wrong when i did something with the partitions on the terminal. now when i boot my computer, it shows the above message. windows is uninstalled, i have no bootloader. when i try to install ubuntu and boot from my usb drive, it doesnt go to installation. instead it shows a black screen that reads "SYSLINUX 4.06 EDD 2012-10-23 Copyright (C) 1994-2012 H. Peter Anvin et al" and stays there.
any ideas? anything would be highly appreciated!
EDIT: here's what i tried from the terminal. and i was doing this to restore my usb drive back to its original state.
Restoring your USB key to it's original state using Linux:
A. First we need to delete the old partitions that remain on the USB key.
Open a terminal and type sudo su Type fdisk -l and note your USB drive letter. Type fdisk /dev/sdx (replacing x with your drive letter) Type d to proceed to delete a partition Type 1 to select the 1st partition and press enter Type d to proceed to delete another partition (fdisk should automatically select the second partition) B. Next we need to create the new partition.
Type n to make a new partition Type p to make this partition primary and press enter Type 1 to make this the first partition and then press enter Press enter to accept the default first cylinder Press enter again to accept the default last cylinder Type w to write the new partition information to the USB key Type umount /dev/sdx1 (replacing x with your drive letter) C. The last step is to create the fat filesystem.
Type mkfs.vfat -F 32 /dev/sdx1 (replacing x with your USB key drive letter)