Default Need help installing linux.

Hello I am using a rooted Trio Stealth Pro 9.7 and I am trying to get archlinux to work on my rooted tablet.
I have all apk's that I need installed but when I get to the terminal screen this is what I get.

app_57@android: / $
app_57@android: / $ cd /mnt/extsd/archlinux
app_57@android: /mnt/extsd/archlinux $ su
/system/bin/sh: sh: not found
127|app_57@android: /mnt/extsd/archlinux $ sh /data/data/com.zpwebsites.linuxonandroid/files/ /mnt/extsd/archlinux/archlinux-SMALL.ext2.img
sh: /data/data/com.zpwebsites.linuxonandroid/files/ Permission denied
127|app_57@android: /mnt/extsd/archlinux $