I've set up VPN using PrivateInternetAccess fine on Ubuntu, there's a guide on their website. (Actually done it on a HP Proliant fine). https://www.privateinternetaccess.com/pages/client-support/#ubuntu_openvpn_installer
Alternatively, I'd boot into Ubuntu using a live CD, format the HDD and install WHS from clean.
@aggi started
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I've set up VPN using PrivateInternetAccess fine on Ubuntu, there's a guide on their website. (Actually done it on a HP Proliant fine). https://www.privateinternetaccess.com/pages/client-support/#ubuntu_openvpn_installer
Alternatively, I'd boot into Ubuntu using a live CD, format the HDD and install WHS from clean.