obdgui: 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/obdgui - from package: obdgpslogger

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