polarssl_pk_verify: 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_pk_verify - from package: libpolarssl-runtime

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

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