I have
apt-cache policy ucf
Installed: 1.17-1osso2
Candidate: 1.17-1osso2

It is version from extras-devel
( http://maemo.org/packages/view/ucf/ )

ls -al /usr/bin/ucf
-rwxr-xr-x 1 root root 30097 Jan 25 2010 /usr/bin/ucf

head -n 1 /usr/bin/ucf
#!/bin/sh


a) install ucf from extras-devel
or
b) modify /usr/bin/ucf
or
c) install bash