fai-softupdate: 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/fai-softupdate - from package: goto-fai

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

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