voxeltoworld: 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/voxeltoworld - from package: minc-tools

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

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