trouble installing ubuntu on galaxy tab 2 10.1 (p5100)

hi,
i want to install ubuntu on a Samsung Galaxy Tab2 10.1 (P5100). I have rooted the tab, installed CWM and busybox. I want to finish the installation with command line in shell but it d'oesn't work.
here is the text response to the command:

To enter the Ubuntu Linux console just type 'bootubuntu'
# bootubuntu
bootubuntu
mknod: /dev/loop7: Permission denied
losetup: /sdcard/ubuntu/ubuntu.img: Permission denied
mount: Invalid argument
mount: No such file or directory
mount: No such file or directory
mount: No such file or directory
Setting /etc/resolv.conf to Google Open DNS 8.8.8.8 and 8.8.4.4
/system/bin/bootubuntu[22]: can't create /data/local/ubuntu/etc/resolv.conf: No such file or directory
/system/bin/bootubuntu[23]: can't create /data/local/ubuntu/etc/resolv.conf: No such file or directory
Setting localhost on /etc/hosts
/system/bin/bootubuntu[25]: can't create /data/local/ubuntu/etc/hosts: No such file or directory
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chroot: can't change root directory to '/data/local/ubuntu': Operation not permitted

Shutting down Ubuntu
failed: No such file or directory
failed: No such file or directory
failed: No such file or directory
failed: Invalid argument
losetup: /dev/block/loop7: Permission denied

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