gt4-interface-install: 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/sbin/gt4-interface-install - from package: lcas-lcmaps-gt4-interface

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

Error in other languages:
gt4-interface-install: bevel nie gevind nie
gt4-interface-install: comandă negăsită
gt4-interface-install: comando não encontrado
gt4-interface-install: commande introuvable
gt4-interface-install: command not found
gt4-interface-install: käsku ei ole
gt4-interface-install: không tìm thấy lệnh
gt4-interface-install: komanda nerasta
gt4-interface-install: Kommando nicht gefunden.
gt4-interface-install: kommandot finns inte
gt4-interface-install: komut yok
gt4-interface-install: nie znaleziono polecenia
gt4-interface-install: níor aimsíodh an t-ordú
gt4-interface-install: no se encontró la orden
gt4-interface-install: no s'ha trobat l'ordre
gt4-interface-install: opdracht niet gevonden
gt4-interface-install: parancs nem található
gt4-interface-install: perintah tidak ditemukan
gt4-interface-install: príkaz nenájdený
gt4-interface-install: příkaz nenalezen
gt4-interface-install: команда не найдена
gt4-interface-install: командата не е открита
gt4-interface-install: 命令找不到
gt4-interface-install: コマンドが見つかりません