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Install .NET Core 3.1 SDK on Ubuntu 18.04 inside WSL

I’m a big fan of WSL (Windows Subsystem for Linux) to test my .NET Core applications on Linux.

Recently I tried to install the .NET Core 3.1 SDK on my Ubuntu distribution inside WSL:

bawu@ORD02476:~$ sudo apt-get install dotnet-sdk-3.1

Reading package lists... Done

Building dependency tree

Reading state information... Done

E: 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'

This didn’t seem to work. He couldn’t find the .NET Core 3.1 SDK inside the package manager.

I first tried to refresh the packages list:

bawu@ORD02476:~$ sudo apt update

0% [Connecting to archive.ubuntu.com] [Connecting to security.ubuntu.com]

Hit:1 http://archive.ubuntu.com/ubuntu bionic InRelease

Get:2 http://archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]

Get:3 http://archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]

Get:4 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]

Get:5 http://archive.ubuntu.com/ubuntu bionic/universe amd64 Packages [8570 kB]

Get:6 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages [593 kB]

Get:7 http://security.ubuntu.com/ubuntu bionic-security/main Translation-en [194 kB]

Get:8 http://security.ubuntu.com/ubuntu bionic-security/restricted amd64 Packages [15.1 kB]

Get:9 http://security.ubuntu.com/ubuntu bionic-security/restricted Translation-en [4684 B]

Get:10 http://security.ubuntu.com/ubuntu bionic-security/universe amd64 Packages [627 kB]

Get:11 http://security.ubuntu.com/ubuntu bionic-security/universe Translation-en [210 kB]

Get:12 http://security.ubuntu.com/ubuntu bionic-security/multiverse amd64 Packages [6120 B]

Get:13 http://security.ubuntu.com/ubuntu bionic-security/multiverse Translation-en [2600 B]

Get:14 http://archive.ubuntu.com/ubuntu bionic/universe Translation-en [4941 kB]

Get:15 http://archive.ubuntu.com/ubuntu bionic/multiverse amd64 Packages [151 kB]

Get:16 http://archive.ubuntu.com/ubuntu bionic/multiverse Translation-en [108 kB]

Get:17 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages [817 kB]

Get:18 http://archive.ubuntu.com/ubuntu bionic-updates/main Translation-en [288 kB]

Get:19 http://archive.ubuntu.com/ubuntu bionic-updates/restricted amd64 Packages [24.1 kB]

Get:20 http://archive.ubuntu.com/ubuntu bionic-updates/restricted Translation-en [6620 B]

Get:21 http://archive.ubuntu.com/ubuntu bionic-updates/universe amd64 Packages [1033 kB]

Get:22 http://archive.ubuntu.com/ubuntu bionic-updates/universe Translation-en [319 kB]

Get:23 http://archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64 Packages [9284 B]

Get:24 http://archive.ubuntu.com/ubuntu bionic-updates/multiverse Translation-en [4508 B]

Get:25 http://archive.ubuntu.com/ubuntu bionic-backports/main amd64 Packages [2512 B]

Get:26 http://archive.ubuntu.com/ubuntu bionic-backports/main Translation-en [1644 B]

Get:27 http://archive.ubuntu.com/ubuntu bionic-backports/universe amd64 Packages [4028 B]

Get:28 http://archive.ubuntu.com/ubuntu bionic-backports/universe Translation-en [1856 B]

Fetched 18.2 MB in 27s (661 kB/s)

Reading package lists... Done

Building dependency tree

Reading state information... Done

131 packages can be upgraded. Run 'apt list --upgradable' to see them.

But this didn’t made any difference:

bawu@ORD02476:~$ apt search dotnet-sdk

Sorting... Done

Full Text Search... Done

The trick is to first let the package manager know that it should include packages from ‘packages.microsoft.com’:

bawu@ORD02476:~$ wget -q https://packages.microsoft.com/config/ubuntu/18.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb

bawu@ORD02476:~$ sudo dpkg -i packages-microsoft-prod.deb

Selecting previously unselected package packages-microsoft-prod.

(Reading database ... 28645 files and directories currently installed.)

Preparing to unpack packages-microsoft-prod.deb ...

Unpacking packages-microsoft-prod (1.0-ubuntu18.04.2) ...

Setting up packages-microsoft-prod (1.0-ubuntu18.04.2) ...

If we now update the package manager, it reads the packages from Microsoft as well:

bawu@ORD02476:~$ sudo apt-get update

Hit:1 http://archive.ubuntu.com/ubuntu bionic InRelease

Hit:2 http://archive.ubuntu.com/ubuntu bionic-updates InRelease

Get:3 https://packages.microsoft.com/ubuntu/18.04/prod bionic InRelease [4003 B]

Hit:4 http://archive.ubuntu.com/ubuntu bionic-backports InRelease

Hit:5 http://security.ubuntu.com/ubuntu bionic-security InRelease

Get:6 https://packages.microsoft.com/ubuntu/18.04/prod bionic/main amd64 Packages [85.1 kB]

Fetched 89.1 kB in 14s (6320 B/s)

Reading package lists... Done

And finally we find the .NET Core SDK when searching for packages:

bawu@ORD02476:~$ apt search dotnet-sdk

Sorting... Done

Full Text Search... Done

dotnet-sdk-2.1/bionic 2.1.802-1 amd64

  Microsoft .NET Core SDK 2.1.802

dotnet-sdk-2.1.105/bionic 2.1.105-1 amd64

  Microsoft .NET Core SDK - 2.1.105

dotnet-sdk-2.1.200/bionic 2.1.200-1 amd64

  Microsoft .NET Core SDK - 2.1.200

dotnet-sdk-2.1.201/bionic 2.1.201-1 amd64

  Microsoft .NET Core SDK - 2.1.201

dotnet-sdk-2.1.202/bionic 2.1.202-1 amd64

  Microsoft .NET Core SDK - 2.1.202

dotnet-sdk-2.1.300-preview2-008533/bionic 2.1.300-preview2-008533-1 amd64

  Microsoft .NET Core SDK 2.1.300 - Preview

dotnet-sdk-2.1.300-rc1-008673/bionic 2.1.300-rc1-008673-1 amd64

Microsoft .NET Core SDK 2.1.300 - rc1

dotnet-sdk-2.2/bionic 2.2.402-1 amd64

  Microsoft .NET Core SDK 2.2.402

dotnet-sdk-3.0/bionic 3.0.101-1 amd64

  Microsoft .NET Core SDK 3.0.101

dotnet-sdk-3.1/bionic 3.1.100-1 amd64

Microsoft .NET Core SDK 3.1.100

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