vdeterm: 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/vdeterm - from package: vde2

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

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