k3d: 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/k3d - from package: k3d

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

Error in other languages:
k3d: bevel nie gevind nie
k3d: comandă negăsită
k3d: comando não encontrado
k3d: commande introuvable
k3d: command not found
k3d: käsku ei ole
k3d: không tìm thấy lệnh
k3d: komanda nerasta
k3d: Kommando nicht gefunden.
k3d: kommandot finns inte
k3d: komut yok
k3d: nie znaleziono polecenia
k3d: níor aimsíodh an t-ordú
k3d: no se encontró la orden
k3d: no s'ha trobat l'ordre
k3d: opdracht niet gevonden
k3d: parancs nem található
k3d: perintah tidak ditemukan
k3d: príkaz nenájdený
k3d: příkaz nenalezen
k3d: команда не найдена
k3d: командата не е открита
k3d: 命令找不到
k3d: コマンドが見つかりません