gpgv2: 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/gpgv2 - from package: gnupg2

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

On Debian possible default full paths are:

/usr/bin/gpgv2 - from package: gpgv2

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

Error in other languages:
gpgv2: bevel nie gevind nie
gpgv2: comandă negăsită
gpgv2: comando não encontrado
gpgv2: commande introuvable
gpgv2: command not found
gpgv2: käsku ei ole
gpgv2: không tìm thấy lệnh
gpgv2: komanda nerasta
gpgv2: Kommando nicht gefunden.
gpgv2: kommandot finns inte
gpgv2: komut yok
gpgv2: nie znaleziono polecenia
gpgv2: níor aimsíodh an t-ordú
gpgv2: no se encontró la orden
gpgv2: no s'ha trobat l'ordre
gpgv2: opdracht niet gevonden
gpgv2: parancs nem található
gpgv2: perintah tidak ditemukan
gpgv2: príkaz nenájdený
gpgv2: příkaz nenalezen
gpgv2: команда не найдена
gpgv2: командата не е открита
gpgv2: 命令找不到
gpgv2: コマンドが見つかりません