Unable to run .net app with Mono - mscorlib.dll not found (version mismatch?)
Solution 1
I got it to work by installing mono-complete:
sudo apt-get install mono-complete
After that, I had folders 2.0, 3.5, 4.0 and more under usr/lib/mono
Solution 2
If you just want to run it, sudo apt-get install libmono2.0-cil libmono-system-net2.0-cil mono-runtime
may suffice.
Solution 3
i got the same problem, for my distro (ubuntu 12. 32 Bit ), mono-complete has not been available. so i just installed the following packages, and mono with the most important dlls has been available:
sudo apt-get install mono-dmcs
sudo apt-get install mono-gmcs
sudo apt-get install mono-devel
Solution 4
the package you're looking for was "libmono-system.data2.0-cil" which is installed with Mono-complete
Solution 5
I ran sudo apt-get purge mono-*
and then sudo apt-get install mono-complete
. This created the files in /usr/lib/mono, however the error was still generated where it was looking for the file in /usr/local/lib/mono which didn't exist.
Tried to change MONO_PATH to the correct location, but didn't work. Finally ended up copying the whole directory to /usr/local/lib which finally got it to work.
Warpin
Updated on July 05, 2022Comments
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Warpin almost 2 years
I have a simple .net command line tool written and compiled under Windows, using .net 3.5SP1. I would like to run it on Linux using Mono.
I am using Ubuntu 12.04, and installed Mono Runtime using the Ubuntu software center. If I try to start my app in the terminal by doing:
mono MyApp.exe
I get the error:
The assembly mscorlib.dll was not found or could not be loaded. It should have been installed in the 'usr/lib/mono/2.0/mscorlib.dll'.
If I navigate to that location, I see that it does not exist. However, there is
usr/lib/mono/4.0/mscorlib.dll
(and some more DLLs in the same folder).So seemingly there is a version mismatch.
[in case it matters,
mono -V
showsMono JIT compiler version 2.10.8.1 (Debia 2.10.8.1-1ubuntu2)
] -
Lex Li almost 12 yearsDid you try to use app.config to set supportedRuntime to .NET 4 on Windows first? Then you should be able to use Mono to run it as .NET 4, as mono executable should pick it up as .NET 4 app.
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bob over 10 yearsI got the same issue with NOOB v1.2. After I started again with Raspbian "Wheezy" os, as Lex pointed out, having <supportedRuntime version="v4.0" /> in app.config made my app to use correct version (4.0) and I didn't have to install mono-complete.
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natli almost 10 yearsFor those experiencing this issue with the 3.4 release, see stackoverflow.com/questions/22285830/…
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m3nda over 8 yearsThis answer is more accurate than "install full mono". Full mono need ~170Mb while NET 2.0 libs are about ~45Mb.
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Tagc about 7 yearsUnfortunately, this did not work for me (pastebin.com/XduV6vPd). Installing mono-complete took a fair bit more time, but it resolved the issue.
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NIA over 6 years@Tagc For me the message disappeared after I additionally did
sudo apt-get install libmono-system-net2.0-cil