mono-boehm: 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/mono-boehm - from package: mono-runtime-boehm

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

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