The snippet in this post http://talk.maemo.org/showpost.php?p...&postcount=383 is a part of the 'install.sh'-script, lines 306 to 312: You have to remove the "" around the text part This removes the mount error.

Prepare your card on a Linux-PC, may even run a Live-CD. Three partitions: First vfat, second swap, third ext3 (ext4, if you want, but remember your choice ) Install the prerequisites from the first post of the thread. I used u-boot from this thread http://talk.maemo.org/showpost.php?p...40&postcount=1 , which needs some more configuration prior to a restart

Here is a short run-through: http://talk.maemo.org/showpost.php?p...&postcount=369 of the configuration #caveman uses. Note the part to change the ubuntu.item file for bootmenu/u-boot to point to the right partitions and file systems!

Final touches need to be done with the just-chroot.sh script inside the ubuntu-n900 to recreate /uInitrd and copy /boot/uImage to /uImage, as in this post http://talk.maemo.org/showpost.php?p...&postcount=347

Personal Note:
Please ask precise questions with your error messages quoted to have some background info, what problems you are facing in the install process.