tune-debian-dev-group-perm: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/sbin/tune-debian-dev-group-perm - from package: drbl

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