funindex: 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/funindex - from package: funtools

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

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