ripflac: command not found

Have You tried accessing the binary with the full path?

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/ripflac - from package: flactag

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