samlsign: 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/samlsign - from package: opensaml2-tools

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

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