usb_modeswitch_dispatcher: 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/usb_modeswitch_dispatcher - from package: usb-modeswitch

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

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