ideviceimagemounter: 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/ideviceimagemounter - from package: libimobiledevice-utils

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

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