blueman-assistant: 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/blueman-assistant - from package: blueman

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

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