ucf: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/ucf - from package: ucf

You may install the required package with command apt-get install {package}

Error in other languages:
ucf: bevel nie gevind nie
ucf: comandă negăsită
ucf: comando não encontrado
ucf: commande introuvable
ucf: command not found
ucf: käsku ei ole
ucf: không tìm thấy lệnh
ucf: komanda nerasta
ucf: Kommando nicht gefunden.
ucf: kommandot finns inte
ucf: komut yok
ucf: nie znaleziono polecenia
ucf: níor aimsíodh an t-ordú
ucf: no se encontró la orden
ucf: no s'ha trobat l'ordre
ucf: opdracht niet gevonden
ucf: parancs nem található
ucf: perintah tidak ditemukan
ucf: príkaz nenájdený
ucf: příkaz nenalezen
ucf: команда не найдена
ucf: командата не е открита
ucf: 命令找不到
ucf: コマンドが見つかりません