1. 安装 HTTPS 支持

sudo apt update
sudo apt install -y apt-transport-https

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2. 添加 Microsoft 的 GPG 密钥

wget https://packages.microsoft.com/keys/microsoft.asc -O- | sudo gpg --dearmor -o /usr/share/keyrings/microsoft.gpg

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3. 添加 .NET 的 apt 源

echo "deb [arch=amd64 signed-by=/usr/share/keyrings/microsoft.gpg] https://packages.microsoft.com/ubuntu/24.04/prod noble main" | sudo tee /etc/apt/sources.list.d/microsoft-dotnet.list

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4. 更新 apt 并安装 .NET SDK 8

sudo apt update
sudo apt install -y dotnet-sdk-8.0

如果你只需要运行时（Runtime，不开发，只运行程序），可以装：

sudo apt install -y aspnetcore-runtime-8.0
# 或
sudo apt install -y dotnet-runtime-8.0

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5. 验证安装

dotnet --version

应该会显示：

root@ubuntuserver1:~# dotnet --version
8.0.408

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