btraceback: 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 CentOS possible default full paths are:

/usr/sbin/btraceback - from package: bacula-common

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/sbin/btraceback - from package: bacula-common
/usr/sbin/btraceback - from package: bareos-common

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

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