View Full Version : [ubuntu] Make USB bootable access denied.

October 6th, 2009, 10:53 PM
I'm using a usb drive to install ubuntu. I'm following a helpful tutorial and it says to make the usb stick bootable, and that I need to use fdisk to set the boot flag.

In the terminal I typed fdisk /dev/sdb1 -a but it came up with:

fdisk: invalid option -- 'a'

Usage: fdisk [-b SSZ] [-u] DISK Change partition table
fdisk -l [-b SSZ] [-u] DISK List partition table(s)
fdisk -s PARTITION Give partition size(s) in blocks
fdisk -v Give fdisk version
Here DISK is something like /dev/hdb or /dev/sda
and PARTITION is something like /dev/hda7
-u: give Start and End in sector (instead of cylinder) units
-b 2048: (for certain MO disks) use 2048-byte sectors
Any help please?

October 6th, 2009, 11:25 PM
I did this yesterday except I did it the easy way using this free software:


unetbootin makes a bootable USB of not just Ubuntu installs but most other Linux distros also. The only problem that I had was that the Linux version didn't work, I had to use the windows one.

Good luck I hope it helps. :)

PS> Any boot experts that can help with my issue? Here:

October 6th, 2009, 11:27 PM
I actually tried Unetbootin about a week ago but I ended up getting stuck in a memory test thing and to get out I had to use my live cd. Problem was I didn't have one because I used Unetbootin.
Thanks for your help anyway!