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APT - パッケージが見つかりません (aspnetcore/dotnet ランタイム、Ubuntu)

tag-icon • tag-icon linux ubuntu apt asp.net ubuntu-20.04
APT - パッケージが見つかりません (aspnetcore/dotnet ランタイム、Ubuntu)

aspnetcore-runtime-3.1パッケージをインストールしようとしています。Microsoftパッケージ署名キーを追加しました。

wget https://packages.microsoft.com/config/ubuntu/20.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
sudo dpkg -i packages-microsoft-prod.deb

ただし、sudo apt install aspnetcore-runtime-3.1次のエラーが発生します:

Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package aspnetcore-runtime-3.1

apt search でパッケージを検索すると、パッケージが存在することがわかります。

$ sudo apt search aspnetcore
Sorting... Done
Full Text Search... Done
aspnetcore-runtime-2.1/focal 2.1.20-1 amd64
  Microsoft ASP.NET Core 2.1.20 Shared Framework

aspnetcore-runtime-3.1/focal 3.1.6-1 amd64
  Shared Framework for hosting of Microsoft ASP.NET Core applications. It is open source, cross-platform and is supported by Microsoft. We hope you enjoy using it! If you do, please consider joining the active community of developers that are contributing to the project on GitHub (https://github.com/aspnet/AspNetCore). We happily accept issues and PRs.

aspnetcore-targeting-pack-3.1/focal 3.1.3-1 amd64
  Shared Framework for hosting of Microsoft ASP.NET Core applications. It is open source, cross-platform and is supported by Microsoft. We hope you enjoy using it! If you do, please consider joining the active community of developers that are contributing to the project on GitHub (https://github.com/aspnet/AspNetCore). We happily accept issues and PRs

記載のトラブルシューティング手順を試してみましたが、マイクロソフトのドキュメント:

sudo dpkg --purge packages-microsoft-prod && sudo dpkg -i packages-microsoft-prod.deb
sudo apt-get update
sudo apt-get install aspnetcore-runtime-3.1

そして

sudo apt-get install -y gpg
wget -O - https://packages.microsoft.com/keys/microsoft.asc | gpg --dearmor -o microsoft.asc.gpg
sudo mv microsoft.asc.gpg /etc/apt/trusted.gpg.d/
wget https://packages.microsoft.com/config/ubuntu/20.04/prod.list
sudo mv prod.list /etc/apt/sources.list.d/microsoft-prod.list
sudo chown root:root /etc/apt/trusted.gpg.d/microsoft.asc.gpg
sudo chown root:root /etc/apt/sources.list.d/microsoft-prod.list
sudo apt-get update; \
  sudo apt-get install -y apt-transport-https && \
  sudo apt-get update && \
  sudo apt-get install -y aspnetcore-runtime-3.1

どちらも同じエラーが発生します。apt search?に表示されていることからパッケージが明らかに利用可能であるにもかかわらず、私は特に混乱しています。

答え1

によるとドキュメンテーション:

:~# cd $HOME
:~# wget https://download.visualstudio.microsoft.com/download/pr/dffd493f-9eb8-483f-81c7-a9e2201574ef/54e7464241e01e7031fd89e6fe88e6da/aspnetcore-runtime-3.1.9-linux-arm64.tar.gz

:~# mkdir -p $HOME/dotnet && tar zxf dotnet.tar.gz -C $HOME/dotnet
:~# export PATH=$PATH:$HOME/dotnet

:~# dotnet --info
  It was not possible to find any installed .NET Core SDKs
  Did you mean to run .NET Core SDK commands? Install a .NET Core SDK from:
      https://aka.ms/dotnet-download

Host (useful for support):
  Version: 3.1.9
  Commit:  774fc3d6a9

.NET Core SDKs installed:
  No SDKs were found.

.NET Core runtimes installed:
  Microsoft.AspNetCore.App 3.1.9 [/root/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 3.1.9 [/root/dotnet/shared/Microsoft.NETCore.App]

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