bsetroot: 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/bsetroot - from package: blackbox

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

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