mblem: 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/mblem - from package: frog

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

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