aubiomfcc: 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/aubiomfcc - from package: aubio-tools

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

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