seahorse-daemon: 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 CentOS possible default full paths are:

/usr/bin/seahorse-daemon - from package: seahorse

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/seahorse-daemon - from package: seahorse-daemon

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

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