mrbias: 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/lib/cmtk/bin/mrbias - from package: cmtk

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

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