polarssl_gen_entropy: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/polarssl_gen_entropy - from package: libpolarssl-runtime

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