Include Ubuntu Rust setup commands

Author: mh07607

tutorials/polkadot-sdk/parachains/zero-to-hero/set-up-a-template.md

@@ -33,14 +33,23 @@ Before getting started, ensure you have done the following:
 
 For this tutorial series, you need to use Rust `1.86`. Newer versions of the compiler may not work with this parachain template version.
 
-Run the following commands to set up the correct Rust version:
+### macOS
 
 ```bash
 rustup default 1.86
 rustup target add wasm32-unknown-unknown --toolchain 1.86-aarch64-apple-darwin
 rustup component add rust-src --toolchain 1.86-aarch64-apple-darwin
 ```
 
+### Ubuntu
+
+```bash
+rustup toolchain install 1.86.0
+rustup default 1.86.0
+rustup target add wasm32-unknown-unknown --toolchain 1.86.0
+rustup component add rust-src --toolchain 1.86.0
+```
+
 ## Utility Tools
 
 This tutorial requires two essential tools: