gtkam: 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/gtkam - from package: gtkam

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

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