ipengine3: 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/ipengine3 - from package: ipython3

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

Error in other languages:
ipengine3: bevel nie gevind nie
ipengine3: comandă negăsită
ipengine3: comando não encontrado
ipengine3: commande introuvable
ipengine3: command not found
ipengine3: käsku ei ole
ipengine3: không tìm thấy lệnh
ipengine3: komanda nerasta
ipengine3: Kommando nicht gefunden.
ipengine3: kommandot finns inte
ipengine3: komut yok
ipengine3: nie znaleziono polecenia
ipengine3: níor aimsíodh an t-ordú
ipengine3: no se encontró la orden
ipengine3: no s'ha trobat l'ordre
ipengine3: opdracht niet gevonden
ipengine3: parancs nem található
ipengine3: perintah tidak ditemukan
ipengine3: príkaz nenájdený
ipengine3: příkaz nenalezen
ipengine3: команда не найдена
ipengine3: командата не е открита
ipengine3: 命令找不到
ipengine3: コマンドが見つかりません