I have a nokia n800, OS 2008.

when following one of the [many] instructions on creating a dual-boot, I encountered a problem.
I was following http://thisweekinnuclear.com/KDEonN800.html since he said that it worked on a n800 with 2008.

however, on the

# mkdir /opt/
# mount /dev/mmcblk0p2 /opt
# mkdir /floppy/
# mount -t jffs2 -o ro /dev/mtdblock4 /floppy

the system said that:
1) /opt/ and /floppy/ directories existed before.

2) after a
# rm -rf /opt/
# mkdir /opt/
# mount /dev/mmcblk0p2 /opt

I got :
mount: mounting /dev/mmcblk0p2 on /opt failed

why???
Is there anything I can do?

thank you in advance