I've tried to install debian8 with encryption:

https://www.linode.com/docs/security/encryption/use-luks-for-full-disk-encryption/

Somehow i messed up some configuration.
I'm not sure if the network should work when the tutorial is finished. I've got errors like:

ping: google.com: Temporary name resolution error

Solution

This helped me to fix the problem:
https://www.linode.com/docs/platform/network-helper/#what-is-modified-in-those-files

I would add some further hint, about what is unique:
Replace eth0 by your logical network device name.
By:

echo /sys/class/net/*

Get address and gateway at networking section …

Maybe someone else finds this useful.