I just had the same problem when upgrading from 14.04 to 15.04.

The workaround I did was following:
1. use dpkg --ignore-depends=ppp to install packages that directly depend on 
ppp: network-manager, network-manager-pptp, etc.
2. edit meta info of these packages in /var/lib/dpkg/status to point to ppp 
2.4.5 from 2.4.6;
3. apt-get dist-upgrade;
4. download the source code: ppp_2.4.6.orig.tar.gz
5. follow the readme to configure/make and fix the type cast error;
6. use checkinstall to create the package and dpkg install;
7. update and a patch: 2.4.6-3.1ubuntu1 to it will be applied;
8. done.

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https://bugs.launchpad.net/bugs/1453516

Title:
  package ppp 2.4.6-3.1ubuntu1 failed to install/upgrade: subprocess new
  pre-installation script returned error exit status 1

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