诺大个ubuntu，设置个l2tp的VPN，几乎要吐血。哪位大大帮帮我。network-manager-l2tp ubuntu 16.04这些个关键词已经百度了100遍。求有效解决方法。

项目主页：https://github.com/nm-l2tp
没啥有用信息

晕倒，连接被屏蔽了
连接在这https://seed4.me/pages/setup/vpn-ubuntu-l2tp 一步步都有图。

http://askubuntu.com/a/797764
On 16.04, you could try building and installing network-manager-l2tp which is a L2TP/IPsec VPN plugin for NetworkManager.

谢谢，到mac里面挂了vpn才能看到。。。先试试看。

已经成功搞定！！
步骤：
On 16.04, you could try building and installing network-manager-l2tp which is a L2TP/IPsec VPN plugin for NetworkManager.

See the following page for the package prerequisites and strongSwan AppArmor workaround:https://github.com/nm-l2tp/network-manager-l2tp/issues/12

also as that page mentions upgrade to NetworkManager 1.2.2 or later.

Issue the following on the command-line (note: the backslash character \ is the shell line continuation character which can safely be copy and pasted) :

git checkout 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
=========================
Package prerequisites for building and running

Issue the following on the command-line to install the prerequisite packages (note: the backslash character \ is the shell line continuation character and is safe to copy and paste) :

sudo apt install \
intltool \
libtool \
network-manager-dev \
libnm-util-dev \
libnm-glib-dev \
libnm-glib-vpn-dev \
libnm-gtk-dev \
libnm-dev \
libnma-dev \
ppp-dev \
libdbus-glib-1-dev \
libsecret-1-dev \
libgtk-3-dev \
libglib2.0-dev \
xl2tpd \
strongswan
NetworkManager on Ubuntu 16.04

Ubuntu 16.04 originally shipped with network-manager-1.1.93 (a developer release-candidate version of NetworkManager 1.2), which amongst other things, required the NetworkManager-l2tp --enable-absolute-paths configure switch.

On Ubuntu 16.04, it is recommended to upgrade the network-manager package to version 1.2.0 or later.

IPsec

strongSwan's charon and stroke daemons are prevented from performing correctly as child processes under NetworkManager-l2tp due to an AppArmor name space issue involving NetworkManager and the AppArmor profiles for charon and stroke.

Currently the simplest workaround is to disable two strongSwan AppArmor profiles :

sudo apparmor_parser -R /etc/apparmor.d/usr.lib.ipsec.charon
sudo apparmor_parser -R /etc/apparmor.d/usr.lib.ipsec.stroke
L2TP

In some situations a L2TP connection isn't able to be established with the system xl2tpd package, while it can be established with a locally built xl2tpd installed to /usr/local/ :

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

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

Issuing sudo journalctl -b on the command-line may provide hints for the cause of AppArmor, strongSwan and xl2tpd issues.
============================
基本上没什么问题，可以登录VPN了。。。

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