butc: 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/sbin/butc - from package: openafs-client

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

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