Can't install .net core 3.1 on xenial

@joshua-anderson @akoeplinger @nterry

Installing .NET Core
$ export DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1
$ export DOTNET_CLI_TELEMETRY_OPTOUT=1
10.22s0.35sE: Unable to locate package dotnet-sdk-3.1
E: Couldn't find any package by glob 'dotnet-sdk-3.1'
E: Couldn't find any package by regex 'dotnet-sdk-3.1'
The command "sudo apt-get install -qq dotnet-sdk-3.1=3.1.102*" failed and exited with 100 during .

Your build has been stopped.

Worked fine this morning. Can you tell me what’s wrong?
this is the build, but it’s a private build so you may not have access to it: https://travis-ci.com/github/applitools/Eyes.Sdk.DotNet/builds/172820224

Same here. Build worked fine this morning but failed just now.
https://travis-ci.org/github/Coding-Enthusiast/FinderOuter/builds/701650547

We’re seeing the same behavior with the dotnet-sdk-2.2 image.

https://travis-ci.org/github/AndcultureCode/AndcultureCode.Cli/builds/701687487

Checking MS’ repo contents: https://travis-ci.com/github/native-api/test_travis/builds/172895852

@brandongregoryscott dotnet-sdk-2.2 is available at the moment, try again.

@itaibh same for dotnet-sdk-3.1=3.1.102*.

Looks like MS was updating their repo and it was empty for some time.

Restarted the same build hours later and the problem seems to have been fixed.

Thanks. It’s working now.