wapua: 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/wapua - from package: wapua

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

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