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I haven't found any concise explanation of this.

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up vote 7 down vote accepted

So you're looking for a package containing a file called System.Windows.Forms.dll. You can search:

Both methods lead you to (as of Ubuntu 14.04):

Install it with:

sudo apt-get install libmono-system-windows-forms4.0-cil
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Open Synaptic and search for System.Windows.Forms and select libmono-winforms2.0-cil or libmono-winforms1.0-cil and then apply.

(optional) You might need to install System.Runtime package as well. just search for that and install libmono-system-runtime2.0-cil or libmono-system-runtime1.0-cil

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Found it via this link:

% apt-get install libmono-winforms1.0-cil libmono-winforms2.0-cil
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