ml-burg: 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/ml-burg - from package: ml-burg
/usr/lib/smlnj/bin/ml-burg - from package: ml-burg

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

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