Comment 3 for bug 1514104

Temporary fix: remove the package using APT, and use the old binary after manually installing the required libs. Steps:

```
sudo apt-get remove --purge synapse
sudo apt-get autoremove --purge
sudo apt-get install libgtkhotkey1 libzeitgeist-1.0-1
cp /path-to-old-xubuntu-15_04-mountpoint/usr/bin/synapse ~/.local/bin
```

Then just make sure that ~/.local/bin is at first place in your $PATH.