ucfr: 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/ucfr - from package: ucf

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

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