barada-add: command not found

Have You tried accessing the binary with the full path?

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/sbin/barada-add - from package: libpam-barada

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