update-default-wordlist: 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/sbin/update-default-wordlist - from package: dictionaries-common

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

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