flextra.gfs: 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/flextra.gfs - from package: flextra

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

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