Copy Ubuntu LiveUSB

Ubuntu comes with a very useful tool "USB Startup Disk Creator" for creating a LiveUSB (similar to the LiveCD, but with persistence and is more easily customisable). However strangely enough once booted from the LiveUSB you cannot then use the tool to create another or to copy a version of the Ubuntu installation media - even though the complete CD is available on the LiveUSB.

The solution is a single command to recreate the Ubuntu CD from the LiveCD's mounted /cdrom directory. This can then be burned to physical CDs or used by the "USB Startup Disk Creator" tool to create another USB. It might also be booted by Qemu or Vmware as a virtual system.

genisoimage -D -r -V "Ubuntu 9.04 i386" -cache-inodes -J -l -b syslinux/isolinux.bin -c syslinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -o cd.iso -m "casper-rw" /cdrom/

See https://help.ubuntu.com/community/LiveCDCustomization for further customisation tips