# (Ubuntu 18.04 LTS) Could not load file or assembly 'netstandard, Version=2.0.0.0

**URL:** https://forum.duplicati.com/t/ubuntu-18-04-lts-could-not-load-file-or-assembly-netstandard-version-2-0-0-0/17050
**Category:** Uncategorized
**Created:** [November 20, 2023, 11:56pm UTC](https://forum.duplicati.com/t/ubuntu-18-04-lts-could-not-load-file-or-assembly-netstandard-version-2-0-0-0/17050 "2023-11-20T23:56:17Z")
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### Author: ![ts678](https://forum.duplicati.com/letter_avatar_proxy/v4/letter/t/8491ac/32.png) [@ts678](https://forum.duplicati.com/u/ts678)
#### Post date: [November 21, 2023, 1:27pm UTC](https://forum.duplicati.com/t/ubuntu-18-04-lts-could-not-load-file-or-assembly-netstandard-version-2-0-0-0/17050/4 "2023-11-21T13:27:45Z")

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Welcome to the forum @geee1w

> [@Jojo-1000](#):
>
> I think the default mono package doesn’t have all the libraries.

Supported by [this](https://forum.duplicati.com/t/110-canary-multiple-sources-not-supported/10583/2) forum post and a 2013 decision from the `mono` devs, still with an open issue on

> <https://github.com/mono/mono/issues/17148>
>
> The netstandard.dll is located in Debian/Ubuntu’s "mono-devel" package, which re…quires Mono users to install the complete Mono development platform in order to run a .NET app. Having to force end-users to install the whole development platform in order to run a .NET app is currently preventing many developers from including .NET Standard 2.0 projects in multi-platform software that targets “normal” (non-developer) users.
> 
> It would make much more sense to move the netstandard.dll into the "libmono-corlib\*" or "mono-runtime" packages instead.
> 
> Mono users in Debian/Ubuntu who haven’t installed the "mono-devel" or "mono-complete" packages currently get an Unhandled Exception saying something like:
> 
> \`System.IO.FileNotFoundException: Could not load file or assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. \`
> 
> \## On which platforms did you notice this
> 
> \[\] macOS
> \[x \] Linux
> \[\] Windows
> 
> \*\*Version Used\*\*: 5.18.0.240 and 6.4.0.198
> 
> \<!--
> You can use \`mono --version\` or About dialog to obtain this information.
> \--\>

Please see if following the installation directions provides you with assemblies reported as missing.  
Attempting to trace with dpkg and apt series of tools gave a clearer answer for mono than graphics.

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