xfm2def: 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/xfm2def - from package: minc-tools

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

Error in other languages:
xfm2def: bevel nie gevind nie
xfm2def: comandă negăsită
xfm2def: comando não encontrado
xfm2def: commande introuvable
xfm2def: command not found
xfm2def: käsku ei ole
xfm2def: không tìm thấy lệnh
xfm2def: komanda nerasta
xfm2def: Kommando nicht gefunden.
xfm2def: kommandot finns inte
xfm2def: komut yok
xfm2def: nie znaleziono polecenia
xfm2def: níor aimsíodh an t-ordú
xfm2def: no se encontró la orden
xfm2def: no s'ha trobat l'ordre
xfm2def: opdracht niet gevonden
xfm2def: parancs nem található
xfm2def: perintah tidak ditemukan
xfm2def: príkaz nenájdený
xfm2def: příkaz nenalezen
xfm2def: команда не найдена
xfm2def: командата не е открита
xfm2def: 命令找不到
xfm2def: コマンドが見つかりません