Hmm...mine n900 doesnt know ucfr. I copied attached ucfr to here:

Nokia-N900:~# ll /usr/bin/ucf*
-rwxr-xr-x 1 root root 30097 Jan 25 2010 /usr/bin/ucf
-rwxr-xr-x 1 root root 10747 Jul 22 10:47 /usr/bin/ucfr
Nokia-N900:~#

but dpkd samba-common still fails:

Nokia-N900:~# dpkg --configure samba-common
Setting up samba-common (3.4.3-maemo2) ...
Replacing config file /etc/samba/smb.conf with new version
/var/lib/dpkg/info/samba-common.postinst: line 123: ucfr: not found

-p