miller@penguin:~$ sudo aptitude install pptp-linux
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Reading extended state information      
Initializing package states... Done
Building tag database... Done      
The following packages have been automatically kept back:
  beryl-core beryl-manager beryl-plugins beryl-plugins-data beryl-settings emerald libemeraldengine0 libvlc0 libxine1 php5-common vim-gui-common vim-runtime vlc-nox 
  xchat-common 
The following packages have been kept back:
  automatix2 beryl ekiga gnupg inkscape libberyldecoration0 libberylsettings0 libgphoto2-2 libgphoto2-port0 libxine-main1 p7zip php5-cgi tcpdump tzdata update-manager 
  vim-common vim-gnome vim-tiny vlc vlc-plugin-arts vlc-plugin-esd wxvlc xchat 
The following NEW packages will be installed:
  pptp-linux 
0 packages upgraded, 1 newly installed, 0 to remove and 37 not upgraded.
Need to get 0B/44.7kB of archives. After unpacking 180kB will be used.
Writing extended state information... Done
dpkg: regarding .../pptp-linux_1.7.0-2ubuntu1_amd64.deb containing pptp-linux:
 pptp conflicts with pptp-linux
  pptp-linux (version 1.7.0-2ubuntu1) is to be installed.
dpkg: error processing /var/cache/apt/archives/pptp-linux_1.7.0-2ubuntu1_amd64.deb (--unpack):
 conflicting packages - not installing pptp-linux
Errors were encountered while processing:
 /var/cache/apt/archives/pptp-linux_1.7.0-2ubuntu1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
A package failed to install.  Trying to recover:
dpkg: dependency problems prevent configuration of network-manager-pptp:
 network-manager-pptp depends on pptp-linux; however:
  Package pptp-linux is not installed.
dpkg: error processing network-manager-pptp (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 network-manager-pptp