title: How to install duplicati 2.0 on debian?
body: <p>I have a problem when I install debian distro on Duplicati. I'm trying :
  <code>sudo apt-get install mono-complete
  cd /usr/lib
  mkdir Duplicati
  cd Duplicati
  wget http://updates.duplicati.com/preview/latest.zip
  unzip latest.zip
  mono Duplicati.GUI.TrayIcon.exe</code></p>
  
  <p>I have the following error message:</p>
  
  <p>'Missing method System.Threading.Tasks.Task :: WhenAll (Task []) in /usr/lib/mono/4.0/mscorlib.dll assembly, referenced in assembly /usr/lib/duplicati/Duplicati.Library.UsageReporter.dll
  Crash!'
  and more...</p>
  
  <p>do you have an idea about the problem?
  thank you</p>