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1. 把下面一行加到/etc/apt/source.list
deb http://quozl.netrek.org/pptp/pptpconfig ./
别忘记了后面的./，然后
sudo apt-get install pptpconfig
会根据依赖关系安装大概10个包左右

2. 在终端输入sudo pptpconfig, 出现图形配置界面，作如下配置：
点击Server标签，填入以下各项
Name: 给你的VPN起个名字，随便填
Server: 219.239.104.3 这是师大的VPN IP地址
Domain: 空置不填
User Name: 填入借书证号
Password: 填入借书证密码
点击Routing标签, 选择All to Tunnel
点击DNS标签，去掉Automatic, 并空置下面两栏不填
点击 Encryption标签，去掉所有项
点击ADD，把刚刚做的设置加入VPN配置列表

3. 修改配置文件：
在终端执行sudo gedit /etc/ppp/options.pptp
用#号注释掉下面两句
refuse-chap
refuse-mschap
并将Encrption以下的行全部注释掉

4. 在终端中输入sudo pptpconfig，点击Start

sudo gedit /etc/ppp/options.pptp

###############################################################################
# $Id: options.pptp,v 1.1 2005/02/18 01:40:23 quozl Exp $
#
# Sample PPTP PPP options file /etc/ppp/options.pptp
# Options used by PPP when a connection is made by a PPTP client.
# This file can be referred to by an /etc/ppp/peers file for the tunnel.
# Changes are effective on the next connection. See "man pppd".
#
# You are expected to change this file to suit your system. As
# packaged, it requires PPP 2.4.2 or later from http://ppp.samba.org/
# and the kernel MPPE module available from the CVS repository also on
# http://ppp.samba.org/, which is packaged for DKMS as kernel_ppp_mppe.
###############################################################################

# Lock the port
lock

# Authentication
# We don't need the tunnel server to authenticate itself
noauth

# We won't do EAP, CHAP, or MSCHAP, but we will accept MSCHAP-V2
refuse-eap
#refuse-chap
#refuse-mschap

# Compression
# Turn off compression protocols we know won't be used
nobsdcomp
nodeflate

# Encryption
# (There have been multiple versions of PPP with encryption support,
# choose with of the following sections you will use. Note that MPPE
# requires the use of MSCHAP-V2 during authentication)

# http://ppp.samba.org/ the PPP project version of PPP by Paul Mackarras
# ppp-2.4.2 or later with MPPE only, kernel module ppp_mppe.o
# {{{
# Require MPPE 128-bit encryption
#require-mppe-128
# }}}

# http://polbox.com/h/hs001/ fork from PPP project by Jan Dubiec
# ppp-2.4.2 or later with MPPE and MPPC, kernel module ppp_mppe_mppc.o
# {{{
# Require MPPE 128-bit encryption
#mppe required,stateless
# }}}

Re: VPN pptp to Windows VPN server
Same error message here...I see lots of threads with this question but none with the answer. this seems like the common/key error message:

Code:

Using interface ppp0pptpconfig: monitoring interface ppp0

Connect: ppp0 <--> /dev/pts/1
LCP: timeout sending Config-Requests
Connection terminated.
Modem hangup
pptpconfig: pppd process terminated by signal 16 (failed)
pptpconfig: SIGUSR1

sudo gedit /etc/ppp/options.pptp

###############################################################################
# $Id: options.pptp,v 1.1 2005/02/18 01:40:23 quozl Exp $
#
# Sample PPTP PPP options file /etc/ppp/options.pptp
# Options used by PPP when a connection is made by a PPTP client.
# This file can be referred to by an /etc/ppp/peers file for the tunnel.
# Changes are effective on the next connection. See "man pppd".
#
# You are expected to change this file to suit your system. As
# packaged, it requires PPP 2.4.2 or later from http://ppp.samba.org/
# and the kernel MPPE module available from the CVS repository also on
# http://ppp.samba.org/, which is packaged for DKMS as kernel_ppp_mppe.
###############################################################################

# Lock the port
lock

# Authentication
# We don't need the tunnel server to authenticate itself
noauth

# We won't do EAP, CHAP, or MSCHAP, but we will accept MSCHAP-V2
refuse-eap
refuse-chap
refuse-mschap

# Compression
# Turn off compression protocols we know won't be used
nobsdcomp
nodeflate

# Encryption
# (There have been multiple versions of PPP with encryption support,
# choose with of the following sections you will use. Note that MPPE
# requires the use of MSCHAP-V2 during authentication)

# http://ppp.samba.org/ the PPP project version of PPP by Paul Mackarras
# ppp-2.4.2 or later with MPPE only, kernel module ppp_mppe.o
# {{{
# Require MPPE 128-bit encryption
require-mppe-128
# }}}

# http://polbox.com/h/hs001/ fork from PPP project by Jan Dubiec
# ppp-2.4.2 or later with MPPE and MPPC, kernel module ppp_mppe_mppc.o
# {{{
# Require MPPE 128-bit encryption
#mppe required,stateless
# }}}

Using interface ppp1
pptpconfig: monitoring interface ppp1
Connect: ppp1 <--> /dev/pts/1
CHAP authentication succeeded
MPPE 128-bit stateless compression enabled
Cannot determine ethernet address for proxy ARP

feisty下的方法：
1. 安装附件里的包。
2. sudo apt-get remove network-manager network-manager-gnome
3. sudo pico /etc/ppp/peers/vpnnet, 添加：
pty "pptp vpn.classnet.cuhk.edu.hk --nolaunchpppd"
##注意： vpn.classnet.cuhk.edu.hk换成你自己的VPN服务器地址
file /etc/ppp/options.pptp
remotename PPTP
persist
defaultroute
usepeerdns
name youruserID
4. sudo pico /etc/ppp/options.pptp, 注释掉 require-mppe-128
5. sudo pico /etc/ppp/pap-secrets, 在最后一行添加：
youruserID PPTP yourpassword
##注意：如果认证方式是chap，那么就编辑chap-secrets文件，而不是pap-secrets。
6. 启动：
sudo pon vpnnet
7. 关闭：
sudo poff vpnnet

relaxssl 写了：rhfcaesar
你提供的63楼的方法中的第三步，我不知道如何添加，输入sudo pico /etc/ppp/peers/vpnnet之后，在终端出现的不是gedit的文档，如图

代码： 全选

sudo pico /etc/ppp/peers/vpnnet, 添加：
pty "pptp vpn.classnet.cuhk.edu.hk --nolaunchpppd"
##注意： vpn.classnet.cuhk.edu.hk换成你自己的VPN服务器地址
file /etc/ppp/options.pptp
remotename PPTP
persist
defaultroute
usepeerdns
name youruserID 

relaxssl 写了：第二步

代码： 全选

sudo apt-get remove network-manager network-manager-gnome 

执行之后，网络联接图标消失了。