morbo: 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/morbo - from package: libmojolicious-perl

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

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