gmerlin_launcher: 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/gmerlin_launcher - from package: gmerlin

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

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