guimb: 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/guimb - from package: mailutils-guile

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

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