simage-config: 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/simage-config - from package: libsimage-dev

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

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