drbl-langchooser: 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-langchooser - from package: drbl

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

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