Add support for Ubuntu 20.10 "Groovy Gorilla"

[rbhanda]

This issue is created to track progress for the work to enable Ubuntu 20.10 support for .NET Core 3.1, 2.1 and .NET 5.

Product and Test updates

• [All teams] Do a compatibility check for the product with the new OS
• [CoreCLR/CoreFX] Runtime / RID Support update
• [Infra] Ensure that the correct Docker images used by teams are built in the dotnet-buildtools-prereqs (if applicable)
• [Infra] Replace docker tags used in builds across repos and branches
• [CLI team] Update CI legs to latest updated Dockerfile
• [All teams] Update test infrastructure to support the new version
• [Acquisition] Add support within nightly repos
• [Acquisition] Deploy to master (GA) during next patch release cycle

Release team:

• Notify .NET Core teams regarding new OS release
• Add feed for new OS release to packages.microsoft.com
• Update release manifest files
• Create new Docker files to test the new OS
• Update the supported OS content on GitHub and marketing sites.

Document updates:

• Add OS prerequisites to the dependencies document
• Update distro install page

[Mizux]

FYI Ubuntu 20.10 is due for release on October 22, 2020.
ref: https://www.omgubuntu.co.uk/2020/05/ubuntu-20-10-release-features

BUT, you can already find docker image on DockerHub...

my test

Dockerfile:

# Create a virtual environment with all tools installed
# ref: https://hub.docker.com/_/ubuntu
FROM ubuntu:20.10 AS env

RUN apt update -q
RUN apt install -y wget apt-transport-https

# Dotnet Install
# see: https://docs.microsoft.com/en-us/dotnet/core/install/linux-ubuntu#2010-
RUN wget https://packages.microsoft.com/config/ubuntu/20.10/packages-microsoft-prod.deb
RUN dpkg -i packages-microsoft-prod.deb
RUN apt update -q
RUN apt install -yq dotnet-sdk-3.1

# Trigger first run experience by running arbitrary cmd
RUN dotnet --info

Test:

docker build .

[richlander]

FYI: We only publish container images for Ubuntu LTS releases.

[Mizux]

To avoid any ambiguity, I don't want any container image, I only need an Ubuntu 20.10 dotnet-sdk-3.1 feed so I can integrate it in our Google OR-Tools docker container to provide our .Net native prebuilt binaries...
ref: https://github.com/google/or-tools/blob/stable/tools/docker/ubuntu-20.10.Dockerfile

The simplified Dockerfile above is just a way to reproduce the error and what I'm looking for, unless for Ubuntu 20.10 you'll manage to integrate dotnet-sdk directly into an official ubuntu feed ?

[rbhanda]

Unable to install 5.0 RC 2 on Ubuntu 20.10 #5352

[dagood]

.NET Core 3.1 and .NET 5.

Missing .NET Core 2.1?

[rbhanda]

Updated the issue with 2.1 as well. I am able to install both on Ubuntu 20.10

[dagood]

Neither 3.1 or 2.1 works for me using the package repository, for the same underlying reason installing 5.0-rc2 via .deb doesn't work (#5352).

[rbhanda]

@jamshedd FYI.