https://wiki.ubuntu.com/LiveUsbPendrivePersistent

wget http://launchpadlibrarian.net/15990491/initrd.gz.8.04.1.casper.fixed
sudo apt-get install syslinux mtools
dmesg | tail
sudo umount /dev/sdc1
sudo fdisk /dev/sdc
sudo fdisk -l /dev/sdc
# Apparaat Opstart   Begin       Einde     Blokken   ID  Systeem
#/dev/sdc1               1         247      244993    c  W95 FAT32 (LBA)
#/dev/sdc2   *         248        1015      761856    e  W95 FAT16 (LBA)
sudo mkfs.vfat -n casper-rw /dev/sdc1
sudo mkfs.vfat -F 32 -n ubuntu /dev/sdc2
sudo mount -t vfat /dev/sdc1 /media/casper-rw
sudo mount -t vfat /dev/sdc2 /media/ubuntu
sudo mkdir /media/iso
sudo mount -o loop kubuntu-8.04.1-desktop-i386.iso /media/iso
cd /media/iso
#-r--r--r--  1 root root 1083932 2008-06-30 17:33 wubi.exe
#-r--r--r--  1 root root  199520 2008-07-01 16:08 umenu.exe
#-r--r--r--  1 root root      40 2008-07-01 23:18 autorun.inf
#lr-xr-xr-x  1 root root       1 2008-07-01 23:19 ubuntu -> ./
#-r--r--r--  1 root root     224 2008-07-01 23:19 README.diskdefines
#dr-xr-xr-x  2 root root    2048 2008-07-01 23:19 preseed/
#dr-xr-xr-x  4 root root    2048 2008-07-01 23:19 pool/
#dr-xr-xr-x  2 root root    2048 2008-07-01 23:19 pics/
#dr-xr-xr-x  3 root root    2048 2008-07-01 23:19 dists/
#dr-xr-xr-x  2 root root    2048 2008-07-01 23:19 .disk/
#dr-xr-xr-x 10 root root    2048 2008-07-01 23:19 ./
#dr-xr-xr-x  2 root root   12288 2008-07-01 23:19 isolinux/
#dr-xr-xr-x  2 root root    2048 2008-07-01 23:19 install/
#dr-xr-xr-x  2 root root    2048 2008-07-01 23:19 casper/
#-r--r--r--  1 root root    5377 2008-07-01 23:19 md5sum.txt
#drwxr-xr-x 13 root root    4096 2008-09-14 09:43 ../
sudo cp -vrf .??* * /media/ubuntu
cd /media/ubuntu
sudo mv isolinux syslinux
sudo mv syslinux/isolinux.cfg syslinux/syslinux.cfg
sudo vi syslinux/syslinux.cfg
#DEFAULT persistent
#GFXBOOT bootlogo
#APPEND  file=/preseed/kubuntu.seed boot=casper initrd=/casper/initrd.gz noquiet nosplash --
#LABEL persistent
#  menu label Start Ubuntu in ^persistent mode
#  kernel /casper/vmlinuz
#  append  file=/preseed/kubuntu.seed boot=casper persistent initrd=/casper/initrd.gz noquiet nosplash --
mv casper/initrd.gz casper/initrd.gz.org
cp ~/initrd.gz.8.04.1.casper.fixed casper/initrd.gz
cd
sudo umount /media/ubuntu
sudo syslinux -s /dev/sdc2