terminatorX: 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/terminatorX - from package: terminatorx

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

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