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Editorial Team
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Asked: 2026-05-29T05:57:23+00:00

I had some monodevelop programs with a GTK# user interface running smoothly in ubuntu

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I had some monodevelop programs with a GTK# user interface running smoothly in ubuntu 11.04 without unity. I have upgraded to ubuntu 11.10 with unity. Now I get the following error:

“The type or namespace name ‘Gtk’ could not be found. Are you missing an assembly reference?”.

And indeed in my references the references atk-sharp, gdk-sharp, glade-sharp, glid-sharp, stk-sharp and pango-sharp are colored red and I can’t re-add them.

If I search in the software to install at gtk-sharp then it tells me Gtk# 2.10 is installed.
If I start a new gtk project in monodevelop it gives the same errors.

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1 Answer

  1. Editorial Team

    This issue is due to Mono runtime version. Please change Mono runtime version of the project from Mono/.NET 3.5 to Mono/.NET 4.0 to fix this issue.

    For this, please follow the steps as given below:

    1. Launch ‘Project Options’ dialog using Solution Explorer.
    2. Select ‘General’ project settings available under ‘Build’ group
    3. Change Runtime version to Mono/.NET 4.0.
    4. MonoDevelop will upgrade the current project as Visual Studio 2010
      equivalents. Then, Rebuild the project and verify the outcome.
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