Dear Reader,

Unfortunately, after installing GOG's version of Opus Magnum and launching "Lightning" or "start.sh" files they say:

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Running Opus Magnum
exception inside UnhandledException handler: The type initializer for 'Ionic.Zip.ZipFile' threw an exception.

[ERROR] FATAL UNHANDLED EXCEPTION: #=qNQq_Ap3NhtQs8tWqcNRYSw==: Failed to create FBO
at #=qWrzU3HAfKVYP1dUQOa6XiA==.#=qmBT_fukvRf_df9INVkD9IA== (System.Boolean #=qPZYPhUBqU8e1qs3Yry0ShA==, System.String #=q2ELSJjjqFmC4timzkR9$1w==) [0x00009] in <7c60c2d416e64fb18ce53f6e62641f70>:0
at #=qCjGS749tmTarGw9TZD226QPTvdTn7vSje$RKYukYcvM=.#=qc_a1ymd60_pig8nGlF6e83vTDEsqA3sTpVcz56LNP10= (System.UInt32 #=qfyDgDR2G0zWqF$r4O0OnaQ==, System.UInt32 #=q0427GGuPXqP2RUX2meWZQA==, System.IntPtr& #=qBrC17uCkZBzzp6pIvmbfiA==) [0x0006a] in <7c60c2d416e64fb18ce53f6e62641f70>:0
at Renderer.#=qznEQv1cKRFOmJD9AtSw1Z4Nz4dEi$EbVXwOi7eCqONU= (System.Int32 #=qk5NNq3J37ocKH04O_crg0Q==, System.Int32 #=q7ZBW7GBb7Abu2m1i2A_5dA==) [0x00005] in <7c60c2d416e64fb18ce53f6e62641f70>:0
at GameLogic.#=qxVr4TjGRoIZQatVi4Q_H7a6FtL8K$gFOhSQm$JVmifM= () [0x000ed] in <7c60c2d416e64fb18ce53f6e62641f70>:0
at GameLogic.#=qcq0LwFESme7QdDq1HFB4Q9F8IoSaHVaDh1IxV3dfjK8= (System.Single #=qz9oJ87yuOdzNSC8CDYNxcA==) [0x00025] in <7c60c2d416e64fb18ce53f6e62641f70>:0
at GameLogic.#=q98u9GT0_W8WJxA3qM4bomg== (System.Int32 #=qp8YnvH_uqJFiluhi$o8GxA==, System.Int32 #=qZhH2i1oKLMmprtmqnNIyvw==) [0x0000e] in <7c60c2d416e64fb18ce53f6e62641f70>:0
at #=q$EbHXXrS9LfLWAVB5ET1jmWw8nB8tD0FbHxlFKSP2HY=.#=q1JaILMIpy8i8cJJNCu5F0Q== (System.Action`2[T1,T2] #=qHi5j49GbZub7XCxRmEh16Fl4s1nqHXygYTT9mylbHVI=) [0x00099] in <7c60c2d416e64fb18ce53f6e62641f70>:0
at GameLogic.#=qa6OHaSNK5xXWQgWFXvzSNA== () [0x0058b] in <7c60c2d416e64fb18ce53f6e62641f70>:0
at #=qqeQAZ8mPNJUzYCK3R3Hk$g==.#=quuDgF$dro2KRLw_LBgfePA== (System.String[] #=q9$d$zZCZMz_q3X6d8iuLvQ==) [0x0003e] in <7c60c2d416e64fb18ce53f6e62641f70>:0

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The screen of terminal window is attached;

Also, "uname -a"'s output is: Linux x4 4.13.0-36-generic #40~16.04.1-Ubuntu SMP Fri Feb 16 23:25:58 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux;

All updates are installed.

OpenGL 2.1
CPU: i7 M620

Please, what could it be and how to help it to run properly ?

Best regards

Do you have the package mono-runtime installed on your system? If not, please install it (and all dependencies).

If that doesn't help, I think the only immediate thing you can do is install mono-complete.

Background: Opus Magnum needs Mono to run. Mono is a reimplementation of a subset of .NET

Dear JimPhelps,
Yes, mono-runtime was already installed, so I've tried to install mono-complete and the same:

Running Opus Magnum
exception inside UnhandledException handler: The type initializer for 'Ionic.Zip.ZipFile' threw an exception.

[ERROR] FATAL UNHANDLED EXCEPTION: #=qNQq_Ap3NhtQs8tWqcNRYSw==: Failed to create FBO
at #=qWrzU3HAfKVYP1dUQOa6XiA==.#=qmBT_fukvRf_df9INVkD9IA== (System.Boolean #=qPZYPhUBqU8e1qs3Yry0ShA==, System.String #=q2ELSJjjqFmC4timzkR9$1w==) [0x00009] in <7c60c2d416e64fb18ce53f6e62641f7 ...

That would seem to be a problem. From the game page:

Thank you for your reply
Yes, I've already noticed that OpenGL >= 3.0 ...
So, you think that this error: exception inside UnhandledException handler: The type initializer for 'Ionic.Zip.ZipFile' threw an exception. is because of OpenGL 2.1 ?

I could see that ^ being because of only OpenGL 2.1, but you could always try asking the devs directly.

Already asked them.

Their answer: "This is a problem with the Linux video drivers for this GPU, which don't support some features the game requires. If you're able to dual-boot into Windows that'll probably fix it, as those drivers tend not to have this problem.
...
Unfortunately, I can't imagine that the odds of anyone fixing this are very high. These cards are supposed to support these features (they do on Windows) and the drivers have been around for years, and yet the problem persists. "

So, this should work on Windows's drivers of HD Graphics GPU.

All in all, thank them for their games.