itango3: command not found

Have You tried accessing the binary with the full path?

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/itango3 - from package: python3-pytango

You may install the required package with command apt-get install {package}
Error in other languages:
itango3: bevel nie gevind nie
itango3: comandă negăsită
itango3: comando não encontrado
itango3: commande introuvable
itango3: command not found
itango3: käsku ei ole
itango3: không tìm thấy lệnh
itango3: komanda nerasta
itango3: Kommando nicht gefunden.
itango3: kommandot finns inte
itango3: komut yok
itango3: nie znaleziono polecenia
itango3: níor aimsíodh an t-ordú
itango3: no se encontró la orden
itango3: no s'ha trobat l'ordre
itango3: opdracht niet gevonden
itango3: parancs nem található
itango3: perintah tidak ditemukan
itango3: príkaz nenájdený
itango3: příkaz nenalezen
itango3: команда не найдена
itango3: командата не е открита
itango3: 命令找不到
itango3: コマンドが見つかりません