label3d: 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/label3d - from package: raster3d

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

Error in other languages:
label3d: bevel nie gevind nie
label3d: comandă negăsită
label3d: comando não encontrado
label3d: commande introuvable
label3d: command not found
label3d: käsku ei ole
label3d: không tìm thấy lệnh
label3d: komanda nerasta
label3d: Kommando nicht gefunden.
label3d: kommandot finns inte
label3d: komut yok
label3d: nie znaleziono polecenia
label3d: níor aimsíodh an t-ordú
label3d: no se encontró la orden
label3d: no s'ha trobat l'ordre
label3d: opdracht niet gevonden
label3d: parancs nem található
label3d: perintah tidak ditemukan
label3d: príkaz nenájdený
label3d: příkaz nenalezen
label3d: команда не найдена
label3d: командата не е открита
label3d: 命令找不到
label3d: コマンドが見つかりません