ttx2xgf: command not found

Have You tried accessing the binary with the full path?

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/ttx2xgf - from package: xgridfit

You may install the required package with command apt-get install {package}
Error in other languages:
ttx2xgf: bevel nie gevind nie
ttx2xgf: comandă negăsită
ttx2xgf: comando não encontrado
ttx2xgf: commande introuvable
ttx2xgf: command not found
ttx2xgf: käsku ei ole
ttx2xgf: không tìm thấy lệnh
ttx2xgf: komanda nerasta
ttx2xgf: Kommando nicht gefunden.
ttx2xgf: kommandot finns inte
ttx2xgf: komut yok
ttx2xgf: nie znaleziono polecenia
ttx2xgf: níor aimsíodh an t-ordú
ttx2xgf: no se encontró la orden
ttx2xgf: no s'ha trobat l'ordre
ttx2xgf: opdracht niet gevonden
ttx2xgf: parancs nem található
ttx2xgf: perintah tidak ditemukan
ttx2xgf: príkaz nenájdený
ttx2xgf: příkaz nenalezen
ttx2xgf: команда не найдена
ttx2xgf: командата не е открита
ttx2xgf: 命令找不到
ttx2xgf: コマンドが見つかりません