I did reinstall and now I get:

krzak@ptakubu:~$ monodevelop 
no implementation for interface method MonoDevelop.Ide.Codons.IDisplayBinding::get_DisplayName() in class MonoDevelop.XmlEditor.XmlDisplayBinding
METHOD .ctor()
METHOD CanCreateContentForMimeType(string)
METHOD CreateContentForMimeType(string,System.IO.Stream)
METHOD CanCreateContentForFile(string)
METHOD CreateContentForFile(string)

** ERROR **: file class.c: line 2049 (mono_class_setup_vtable_general): should not be reached
aborting...

=================================================================
Got a SIGABRT while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries 
used by your application.
=================================================================

Stacktrace:

  at (wrapper managed-to-native) System.Reflection.Assembly.GetTypes (bool) <0x00004>
  at (wrapper managed-to-native) System.Reflection.Assembly.GetTypes (bool) <0xffffffff>
  at System.Reflection.Assembly.GetTypes () <0x0000c>
  at MonoDevelop.Core.AddIns.DefaultAddInTree.LoadCodonsAndConditions (System.Reflection.Assembly) <0x00023>
  at MonoDevelop.Core.AddIns.DefaultAddInTree.LoadAssembly (string) <0x0008d>
  at MonoDevelop.Core.AddIns.AddIn.AddRuntimeLibraries (string,System.Xml.XmlElement) <0x00151>
  at MonoDevelop.Core.AddIns.AddIn.ReadXmlContents (string,System.Xml.XmlElement) <0x000ce>
  at MonoDevelop.Core.AddIns.AddIn.Initialize (string) <0x0022a>
  at MonoDevelop.Core.AddIns.AddInTreeSingleton.InsertAddIn (string) <0x00057>
  at MonoDevelop.Core.AddIns.AddInService.PreloadAddin (MonoDevelop.Core.IProgressMonitor,string) <0x0029e>
  at MonoDevelop.Core.AddIns.AddInService.PreloadAddins (MonoDevelop.Core.IProgressMonitor,string[]) <0x00329>
  at MonoDevelop.Ide.Gui.IdeStartup.Run (string[]) <0x00a8d>
  at MonoDevelop.Core.AddIns.AddInService.StartApplication (string,string[]) <0x0017c>
  at MonoDevelop.Startup.SharpDevelopMain.Main (string[]) <0x00039>
  at (wrapper runtime-invoke) System.Object.runtime_invoke_int_string[] (object,intptr,intptr,intptr) <0xffffffff>

Native stacktrace:

        /usr/bin/mono(mono_handle_native_sigsegv+0xde) [0x81566de]
        [0xffffe440]
        /lib/tls/i686/cmov/libc.so.6(abort+0x103) [0xb7d67ef3]
        /usr/lib/libglib-2.0.so.0(g_logv+0x4c2) [0xb7efe122]
        /usr/lib/libglib-2.0.so.0(g_log+0x29) [0xb7efe159]
        /usr/lib/libglib-2.0.so.0(g_assert_warning+0x76) [0xb7efe1d6]
        /usr/bin/mono [0x80f1e32]
        /usr/bin/mono [0x80f24fa]
        /usr/bin/mono(mono_class_init+0x62d) [0x80f2b6d]
        /usr/bin/mono(mono_type_get_object+0x96) [0x815fbd6]
        /usr/bin/mono [0x80a10fc]
        /usr/bin/mono [0x80a2cc0]
        [0xb6f85ce3]
        [0xb6f85c9d]
        [0xb6f85adc]
        [0xb6f6bdd6]
        [0xb6f6bb92]
        [0xb6f6b8c7]
        [0xb6f6b21b]
        [0xb6f6ac28]
        [0xb6f8bcd7]
        [0xb5b4f99a]
        [0xb6a3516e]
        [0xb705f6ad]
        [0xb7475b42]
        [0xb7475a84]
        /usr/bin/mono(mono_runtime_exec_main+0x9f) [0x809972f]
        /usr/bin/mono(mono_runtime_run_main+0x1b9) [0x80999d9]
        /usr/bin/mono(mono_main+0xe47) [0x805d4b7]
        /usr/bin/mono [0x805c162]
        /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xdc) [0xb7d528cc]
        /usr/bin/mono [0x805c0b1]