[Mono-list] Mono 2.0 issues in Ubuntu - where is the problem and how will it be fixed?

Atsushi Eno atsushieno at veritas-vos-liberabit.com
Fri May 11 08:00:07 UTC 2012


To my understanding, Ubuntu does not support GTK# for .NET 2.0 based 
mono runtime, which is not a bug. You are trying to run an app with 
insufficient software components on an OS. If you want to use the 
feature that the OS does not provide, you'll have to provide that by 
yourself, like it wouldn't make sense to bug Microsoft that WP7 does not 
ship with System.Data.

(In other words, while .NET 2.0 could be the LCD, gtk# on .NET 2.0 is not .)

I believe you could build and provide gtk# which is based on .NET 2.0 
profile. Putting package for public would help Ubuntu users. Or 
Ubuntu/Debian people may already have such packages apart from official 
repos. AFAIR there are some "2.0-cil" packages in Ubuntu.

Atsushi Eno

IBBoard wrote:
> It appears there is a problem with running older .Net apps on the 
> latest versions of Ubuntu. If you compile for .Net 2.0 (perhaps 
> because that is your lowest common denominator, because you are 
> working cross-platform and you know some people will still be using 
> WinXP without the huge .Net 3/3.5/4 updates) and run it on Ubuntu then 
> you currently get an instant crash with a message like "Missing method 
> System.Type::op_Inequality(Type,Type) in assembly 
> /usr/lib/mono/2.0/mscorlib.dll, referenced in assembly 
> /usr/lib/mono/gac/gtk-sharp/"
> It looks like this problem is quite prevalent and problematic 
> (https://bugs.launchpad.net/ubuntu/+source/mono/+bug/882501, 
> http://stackoverflow.com/questions/10473868/mono-gtk-hello-world-failing-missing-method, 
> and the rest of Google). The two fixes people have are "recompile" 
> (only an option if you're *only* targeting Ubuntu and want to use 
> v4.0) or "add the --runtime=v4.0 switch" to force a 2.0 app to run as 
> 4.0.
> Based on the assembly mentioned in error and what I've picked up 
> online, am I right in understanding that this is a purely 
> Ubuntu-caused problem because GTK# is now build with the .Net 
> 4.0-compatible compiler? Is there any way they can fix this, or are we 
> stuck with it? And are there any sensible and non-hackish ways to work 
> around this in the meantime?
> I'm working on my own Bash wrapper at the moment to fix this only when 
> necessary 
> (http://dev.ibboard.co.uk/repos/IBDev-IBBoard.WarFoundry.GUI.GTK/files/tip/WarFoundry.sh) 
> but I'm sure there must be better ways to do it.
> Thanks.
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