Hi Robert,

I can confirm i have libmono-posix2.0-cil installed. I even reinstalled it to make sure but my mono apps still aren't working and gives same error messages as before
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$ sudo aptitude reinstall libmono-posix2.0-cil 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Reading extended state information      
Initialising package states... Done
The following packages will be REINSTALLED:
  libmono-posix2.0-cil 
0 packages upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
Need to get 103kB of archives. After unpacking 0B will be used.
Writing extended state information... Done
Get:1 http://ubuntu.virginmedia.com jaunty-updates/main libmono-posix2.0-cil 2.0.1-4ubuntu0.1 [103kB]
Fetched 103kB in 0s (260kB/s)         
(Reading database ... 322176 files and directories currently installed.)
Preparing to replace libmono-posix2.0-cil 2.0.1-4ubuntu0.1 (using .../libmono-posix2.0-cil_2.0.1-4ubuntu0.1_all.deb) ...
Unpacking replacement libmono-posix2.0-cil ...
Setting up libmono-posix2.0-cil (2.0.1-4ubuntu0.1) ...
Reading package lists... Done             
Building dependency tree       
Reading state information... Done
Reading extended state information       
Initialising package states... Done

$ gnome-do

Unhandled Exception: System.TypeInitializationException: An exception was thrown by the type initializer for Mono.Unix.Native.Stdlib ---> System.DllNotFoundException: libMonoPosixHelper.so
  at (wrapper managed-to-native) Mono.Unix.Native.Stdlib:GetDefaultSignal ()
  at Mono.Unix.Native.Stdlib..cctor () [0x00000] 
  --- End of inner exception stack trace ---
  at Mono.Unix.UnixMarshal.AllocHeap (Int64 size) [0x00000] 
  at Mono.Unix.UnixMarshal.StringToHeap (System.String s, Int32 index, Int32 count, System.Text.Encoding encoding) [0x00000] 
  at Mono.Unix.UnixMarshal.StringToHeap (System.String s, System.Text.Encoding encoding) [0x00000] 
  at Mono.Unix.UnixMarshal.StringToHeap (System.String s) [0x00000] 
  at Mono.Unix.Catalog.MarshalStrings (System.String s1, System.IntPtr& p1, System.String s2, System.IntPtr& p2, System.String s3, System.IntPtr& p3) [0x00000] 
  at Mono.Unix.Catalog.Init (System.String package, System.String localedir) [0x00000] 
  at Do.Do.Main (System.String[] args) [0x00000] 

Unhandled Exception: System.TypeInitializationException: An exception was thrown by the type initializer for Mono.Unix.Native.Stdlib ---> System.DllNotFoundException: libMonoPosixHelper.so
  at (wrapper managed-to-native) Mono.Unix.Native.Stdlib:GetDefaultSignal ()
  at Mono.Unix.Native.Stdlib..cctor () [0x00000] 
  --- End of inner exception stack trace ---
  at Mono.Unix.UnixMarshal.AllocHeap (Int64 size) [0x00000] 
  at Mono.Unix.UnixMarshal.StringToHeap (System.String s, Int32 index, Int32 count, System.Text.Encoding encoding) [0x00000] 
  at Mono.Unix.UnixMarshal.StringToHeap (System.String s, System.Text.Encoding encoding) [0x00000] 
  at Mono.Unix.UnixMarshal.StringToHeap (System.String s) [0x00000] 
  at Mono.Unix.Catalog.MarshalStrings (System.String s1, System.IntPtr& p1, System.String s2, System.IntPtr& p2, System.String s3, System.IntPtr& p3) [0x00000] 
  at Mono.Unix.Catalog.Init (System.String package, System.String localedir) [0x00000] 
  at Do.Do.Main (System.String[] args) [0x00000]