cuum: 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/cuum - from package: freewnn-cserver

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

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