lxterm: 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/lxterm - from package: xterm

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

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