polarssl_gen_random_ctr_drbg: 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/polarssl_gen_random_ctr_drbg - from package: libpolarssl-runtime

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

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