gapd: 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/sbin/gapd - from package: gap-scscp

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

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