blueman-manager: 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-manager - from package: blueman

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

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