I am a photographer and I have recently switched to Ubuntu. I used to use Hasselblad's Phocus on my Windows PC and I would like to continue to use it here as well. I have already installed wine but the programme's installation fails every single time I try. Can anyone help? Thanks in advance.
Unless Hasselblad publishes a version running natively in Ubuntu (don't hesitate to ask them) there is no way to get the proprietary Windows and MacOS only Phocus-software running in near professional usability.
In case you really need this very software (e.g. for Hasselblad specific image processing) you may want to consider running in with Windows in a virtual machine (e.g. Virtual Box). Any windows software can be seamlessly integrated with the Ubuntu desktop but you should not expect it to run as smooth and fast as it did on your non-virtualized Windows machine.
You may already use this powerful image processing software that can (and needs to) be highly customized with a variety of plugins including an ufraw plugin for RAW image import (supported cameras are listed on the ufraw project page).
This ambitious software is aimed at the need of photographers. There are many features including RAW image processing (but I have no experience if Hasselblad is supported, if not then do ask the developers if this can be made possible).
As Darktable is very actively developed you may want to consider installing more recent stable versions with additional features and bugfixes by adding the following ppa maintained by the developers to your sources:
I know it's not the answer, but would you care to try UFRaw?
http://ufraw.sourceforge.net/Install.html It can also be installed directly from the Ubuntu Software Center...