drbl-tune-pxecfg-block: 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/share/drbl/bin/drbl-tune-pxecfg-block - from package: drbl

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

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