gbi3: 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/gbi3 - from package: gambas3-dev

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

Error in other languages:
gbi3: bevel nie gevind nie
gbi3: comandă negăsită
gbi3: comando não encontrado
gbi3: commande introuvable
gbi3: command not found
gbi3: käsku ei ole
gbi3: không tìm thấy lệnh
gbi3: komanda nerasta
gbi3: Kommando nicht gefunden.
gbi3: kommandot finns inte
gbi3: komut yok
gbi3: nie znaleziono polecenia
gbi3: níor aimsíodh an t-ordú
gbi3: no se encontró la orden
gbi3: no s'ha trobat l'ordre
gbi3: opdracht niet gevonden
gbi3: parancs nem található
gbi3: perintah tidak ditemukan
gbi3: príkaz nenájdený
gbi3: příkaz nenalezen
gbi3: команда не найдена
gbi3: командата не е открита
gbi3: 命令找不到
gbi3: コマンドが見つかりません