gmusicbrowser: 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/gmusicbrowser - from package: gmusicbrowser

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

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