Update linux.md documentation to reflect current CI build configuration (#26255)

Copilot · TravisEz13 · web-flow · commit 67a34a888f4a · 2025-10-21T19:51:01.000Z
Co-authored-by: copilot-swe-agent[bot] &lt;198982749+Copilot@users.noreply.github.com&gt;
Co-authored-by: TravisEz13 &lt;10873629+TravisEz13@users.noreply.github.com&gt;
diff --git a/.spelling b/.spelling
@@ -622,6 +622,7 @@ NativeCommandProcessor.cs
 NativeCultureResolver
 nativeexecution
 net5.0
+net10.0
 netcoreapp5.0
 netip.ps1.
 netstandard.dll
diff --git a/docs/building/linux.md b/docs/building/linux.md
@@ -5,7 +5,7 @@ We'll start by showing how to set up your environment from scratch.
 
 ## Environment
 
-These instructions are written assuming the Ubuntu 16.04 LTS, since that's the distro the team uses.
+These instructions are written assuming Ubuntu 24.04 LTS (the CI uses ubuntu-latest).
 The build module works on a best-effort basis for other distributions.
 
 ### Git Setup
@@ -41,15 +41,13 @@ In PowerShell:
 
 ```powershell
 Import-Module ./build.psm1
-Start-PSBootstrap
+Start-PSBootstrap -Scenario Both
 ```
 
 The `Start-PSBootstrap` function does the following:
 
-- Adds the LLVM package feed
-- Installs our dependencies combined with the dependencies of the .NET CLI toolchain via `apt-get`
-- Uninstalls any prior versions of .NET CLI
-- Downloads and installs the .NET Core SDK 2.0.0 to `~/.dotnet`
+- Installs build dependencies and packaging tools via `apt-get` (or equivalent package manager)
+- Downloads and installs the .NET SDK (currently version 10.0.100-rc.1) to `~/.dotnet`
 
 If you want to use `dotnet` outside of `Start-PSBuild`, add `~/.dotnet` to your `PATH` environment variable.
 
@@ -69,7 +67,7 @@ Start-PSBuild -UseNuGetOrg
 Congratulations! If everything went right, PowerShell is now built.
 The `Start-PSBuild` script will output the location of the executable:
 
-`./src/powershell-unix/bin/Debug/net6.0/linux-x64/publish/pwsh`.
+`./src/powershell-unix/bin/Debug/net10.0/linux-x64/publish/pwsh`.
 
 You should now be running the PowerShell Core that you just built, if you run the above executable.
 You can run our cross-platform Pester tests with `Start-PSPester -UseNuGetOrg`, and our xUnit tests with `Start-PSxUnit`.
