karbon: 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/karbon - from package: karbon

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

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