kumo-server: command not found

Have You tried accessing the binary with the full path?

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/kumo-server - from package: kumofs

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