jcuber-config-frontend: 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 CentOS possible default full paths are:

/usr/bin/jcuber-config-frontend - from package: jcuber

You may install the required package with command yum install {package}

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