persistence problem with downloaded live-image
I created a live-system on flash-disk with debian-live-6.0.4-amd64-kde-desktop.img, it works. But I can't create persistence.
I followed http://live.debian.net/manual/html/live-manual.en.html and created live-persistence.conf file by doing
$ echo "/home" >> /mnt/live-persistence.conf
$ echo "/var/cache/apt" >> /mnt/live-persistence.conf.
Of course I have a second partition on the flash disk with ext2 file-system and label "persistence". But this partition is not mounted automatically, so I don't understand how it could work. If I modify /etc/fstab, it will be overwritten at system-start.
I also added "persistent" in "syslinux/live.cfg", so I have:
menu label Live Persistent
append initrd=/live/initrd.img boot=live config persistent quiet
as found at http://dmesg.fr/categorie-installation/106-creer-une-cle-usb-debian-squeeze-live-persistent (in french).
So what's wrong?