Fix: ICU package while hosting old .NET in Linux

This avoids ICU entirely and is the cleanest solution on Ubuntu 24.

1️⃣ Install basic dependencies

sudo apt update
sudo apt install -y libssl1.1 zlib1g

libssl1.1 may require a compatibility package or manual install on 24.04.

2️⃣ Set environment variable

export DOTNET_SYSTEM_GLOBALIZATION_INVARIANT=1

Or permanently:

echo 'export DOTNET_SYSTEM_GLOBALIZATION_INVARIANT=1' >> ~/.bashrc

Or for systemd service:

Environment=DOTNET_SYSTEM_GLOBALIZATION_INVARIANT=1

Pros

• No ICU dependency
• Stable on Ubuntu 24
• Works for most business apps

Cons

• No culture-specific formatting (dates, numbers, collation)