remuco-quodlibet: 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/remuco-quodlibet - from package: remuco-quodlibet

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

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