Setting Up L2TP Over IPsec for iDRAC on Ubuntu 16.04 & 16.10

1. Update list of available packages:

sudo apt update

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2. Install needed packages:

sudo apt install intltool libtool git network-manager-dev libnm-util-dev libnm-glib-dev libnm-glib-vpn-dev libnm-gtk-dev libnm-dev libnma-dev ppp-dev strongswan libdbus-glib-1-dev libsecret-1-dev libgtk-3-dev libglib2.0-dev xl2tpd

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3. Reinstall Network Manager:

git clone https://github.com/nm-l2tp/network-manager-l2tp.git
cd network-manager-l2tp
autoreconf -fi
intltoolize
./configure --disable-static --prefix=/usr --sysconfdir=/etc --libdir=/usr/lib/x86_64-linux-gnu --libexecdir=/usr/lib/NetworkManager --localstatedir=/var --with-pppd-plugin-dir=/usr/lib/pppd/2.4.7
make
sudo make install

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4. Remove AppArmor IPsec settings:

sudo apparmor_parser -R /etc/apparmor.d/usr.lib.ipsec.charon
sudo apparmor_parser -R /etc/apparmor.d/usr.lib.ipsec.stroke

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5. Replace x2ltpd with libcap

sudo apt remove xl2tpd
sudo apt install libpcap0.8-dev

wget https://github.com/xelerance/xl2tpd/archive/v1.3.6/xl2tpd-1.3.6.tar.gz
tar xvzf xl2tpd-1.3.6.tar.gz
cd xl2tpd-1.3.6
make
sudo make install

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6. Reboot your system.

7. Now your Network Manager can create L2TP connections.