keyringer: 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/keyringer - from package: keyringer

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

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