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1. 背景

构建ubuntu镜像，然后使用Aspose.slides解析PPTX文档，发现一直提示“No usable version of libssl found”。

2. 尝试

使用deepseek R1、kimi1.5、chatgpt o3，并且都带上联网能力，居然还是没有一个能够真正解决，最后还是通过google找到了有效的处理方法。虽然大模型的总结分析能力已经很强，但搜索到可靠的知识依然还是有所欠缺。

3.最终解决方案

方案论述：Aspose.Slides依赖OpenSSL 1.x 版本

Our developers have investigated the case. If OpenSSL version 3 is installed on the target workstation, then you have two alternatives:
A) Install one of the versions of OpenSSL required by .NET Core 3.1;
B) Wait for .NET 6 to become a .NET runtime hosted in a Python session on all target platforms (estimated in Cs2Python versions 24.04–24.05).

Unfortunately, the default version of OpenSSL on Debian 12 is 3 while .NET Core 3.1 requires OpenSSL 1.x. On this page 36, you can find how to install OpenSSL 1.x on Debian 12. To install the library into the system folder, you should have root access.

Also, you should add the ‘libgdiplus’ package to the ‘apt-get install’ command in the Dockerfile.

After these two steps, we could run the code without any errors.

dockerfile处理方法：

# 安装系统依赖
RUN apt-get update && \apt-get install -y \libreoffice \pkg-config \libicu-dev \libgdiplus \wget && \echo "deb http://security.ubuntu.com/ubuntu focal-security main" > /etc/apt/sources.list.d/focal-security.list && \apt-get update && \apt-get install -y libssl1.1

4. 参考材料

【1】Aspose.Slides for .NET - No Usable Version of Libssl Found with Linux Server

【2】如何在ubuntu22.04版本上安装libssl1.1?