monodevelop: 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/monodevelop - from package: monodevelop

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

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