Natty Narwhal 11.04 is having issues with USB flash drives from SanDisk that have U3 Launchpad. You can either use another brand or use either u3-tool from Ubuntu Repositories or SanDisk's U3 Launchpad Removal Tool to remove U3.
10.04.3 is having issues. You might get a segmentation fault if used from command line. There are many launchpad bugs regarding segmentation fault (eg: 572611).
The 9.10 CDs and DVDs are missing the usb-creator.exe program used by the Windows installation processes discussed below. To install the i386 desktop version to a USB flash drive from a disk image on Windows, use the incredibly easy process described at http://www.pendrivelinux.com/create-...sb-in-windows/
. When you boot the resulting live persistent USB, you can install to your hard disk if you wish at any time, or not.
If you get "Incorrect CD-ROM detected" error on detection stage, reboot, press F6 and then ESC to go to manual boot line editing, and add the option 'cdrom-detect/try-usb=true'.
If the above doesn't solve your CD-ROM detection problem and you used the "Universal USB Installer" to prepare your USB flash drive, another solution might be trying UNetbootin. If you are encountering this problem with UNetbootin, press tab at the splash screen to access the boot line editor.
Some BIOS's (eg., the Eee PC netbook') have trouble recognizing that the USB is bootable. You may have to trick it into booting using the following method: At boot, enter the BIOS by pressing F2. Then, right as you exit the BIOS, hit the Esc key. For some systems, this will bring up the boot menu.
The error "Can not mount /dev/loop1 on /cow" is because usb-creator.exe is not creating a valid casper-rw file holding ext2/ext3 filesystem. Fix: 1) Use Unetbootin or 2) After running usb-creator.exe, recreate casper-rw using cygwin tools or http://www.pendrivelinux.com/casper-...-from-windows/
. (As of April 2010)