clementine: 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/clementine - from package: clementine

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

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