Rebecca,

I'll take a look and see if I can build up my own Ubuntu vm.  We use the Ubuntu instance provided by Azure DevOps without any issues. Here is the documentation provided for that.

Overview
https://docs.microsoft.com/en-us/azure/devops/pipelines/agents/hosted?view=azure-devops

and more specifically related to available tools and libraries.
https://github.com/microsoft/azure-pipelines-image-generation/blob/master/images/linux/Ubuntu1804-README.md

if you figure it out let me know as i don't want us both duplicating effort.

Thanks
Sean