Cumulus Support

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sudo apt-get purge mono-devel

echo "deb http://download.mono-project.com/repo/debian wheezy/snapshots/4.0.5 main" | sudo tee /etc/apt/sources.list.d/mono-xamarin.list 

sudo apt-get update

sudo aptitude install mono-complete=4.0.5.1-0xamarin1

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In order to fix dependencies, aptitude must be used to install mono:
$ sudo aptitude install mono-complete=4.0.5.1-0xamarin1

Then you will get a proposal from aptitude to solve the dependencies:

Keep the following packages at their current version:
1) Do NOT accept this solution, when that would install the current version of mono(4.6.2) which has errors (as documented by SpaceHiker).
Respond with "n"

2) Accept the next solution from aptitude to install mono version 4.0.5 with this warning:
Respond with "Y"

3) At the next prompt:
Respond with "Y"

4) At the last prompt:
Do you want to ignore this warning and proceed anyway?
To continue, enter "yes"; to abort, enter "no":
Respond "yes"

Now mono-complete 4.0.5 will be installed.

In order to protect this old mono version (4.0.5) from future upgrades:
$ sudo apt-mark hold mono-runtime mono-complete

How to show the current Installed version:
$ mono --version