usbmuxd: 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 CentOS possible default full paths are:

/usr/sbin/usbmuxd - from package: usbmuxd

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/sbin/usbmuxd - from package: usbmuxd

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

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