barbican: 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/barbican - from package: python-barbicanclient

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

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