Adjust Linux landing and Ubuntu pages (#45551)

* Tweaks to Ubuntu docs

* Experiment with a new tile landing page for linux

* Adjust TOC

* Index.yml

* Rename the root ubuntu page as the decision guide

Author: adegeo

.openpublishing.redirection.core.json

@@ -765,57 +765,13 @@
             "source_path_from_root": "/docs/core/install/linux-package-manager-sles15.md",
             "redirect_url": "/dotnet/core/install/linux-sles"
         },
-        {
-            "source_path_from_root": "/docs/core/install/linux-package-manager-ubuntu-1604.md",
-            "redirect_url": "/dotnet/core/install/linux-ubuntu"
-        },
-        {
-            "source_path_from_root": "/docs/core/install/linux-package-manager-ubuntu-1804.md",
-            "redirect_url": "/dotnet/core/install/linux-ubuntu"
-        },
-        {
-            "source_path_from_root": "/docs/core/install/linux-package-manager-ubuntu-1904.md",
-            "redirect_url": "/dotnet/core/install/linux-ubuntu"
-        },
-        {
-            "source_path_from_root": "/docs/core/install/linux-package-manager-ubuntu-1910.md",
-            "redirect_url": "/dotnet/core/install/linux-ubuntu"
-        },
-        {
-            "source_path_from_root": "/docs/core/install/linux-package-manager-ubuntu-2004.md",
-            "redirect_url": "/dotnet/core/install/linux-ubuntu"
-        },
         {
             "source_path_from_root": "/docs/core/install/linux-package-managers.md",
             "redirect_url": "/dotnet/core/install/linux"
         },
         {
-            "source_path_from_root": "/docs/core/install/linux-ubuntu-1604.md",
-            "redirect_url": "/dotnet/core/install/linux-ubuntu-install?pivots=os-linux-ubuntu-1604"
-        },
-        {
-            "source_path_from_root": "/docs/core/install/linux-ubuntu-1804.md",
-            "redirect_url": "/dotnet/core/install/linux-ubuntu-install?pivots=os-linux-ubuntu-1804"
-        },
-        {
-            "source_path_from_root": "/docs/core/install/linux-ubuntu-2004.md",
-            "redirect_url": "/dotnet/core/install/linux-ubuntu-install?pivots=os-linux-ubuntu-2004"
-        },
-        {
-            "source_path_from_root": "/docs/core/install/linux-ubuntu-2204.md",
-            "redirect_url": "/dotnet/core/install/linux-ubuntu-install?pivots=os-linux-ubuntu-2204"
-        },
-        {
-            "source_path_from_root": "/docs/core/install/linux-ubuntu-2210.md",
-            "redirect_url": "/dotnet/core/install/linux-ubuntu-install?pivots=os-linux-ubuntu-other"
-        },
-        {
-            "source_path_from_root": "/docs/core/install/linux-ubuntu-2304.md",
-            "redirect_url": "/dotnet/core/install/linux-ubuntu-install?pivots=os-linux-ubuntu-2304"
-        },
-        {
-            "source_path_from_root": "/docs/core/install/linux-ubuntu-2310.md",
-            "redirect_url": "/dotnet/core/install/linux-ubuntu-install?pivots=os-linux-ubuntu-2310"
+            "source_path_from_root": "/docs/core/install/linux-ubuntu.md",
+            "redirect_url": "/dotnet/core/install/linux-ubuntu-install"
         },
         {
             "source_path_from_root": "/docs/core/install/runtime.md",

docs/core/install/includes/linux-ubuntu-80-ms.md

@@ -6,4 +6,4 @@ ms.topic: include
 ms.custom: linux-related-content
 ---
 
-.NET 8.0 isn't available in the Ubuntu package repository. [Register the Microsoft package repository](../linux-ubuntu.md#register-the-microsoft-package-repository) and use that feed to install .NET through APT. If you use the Microsoft package repository to install .NET, you should deprioritize .NET packages from the Ubuntu repository. For more information, see [I need a version of .NET that isn't provided by my Linux distribution](../linux-package-mixup.md?pivots=os-linux-ubuntu#i-need-a-version-of-net-that-isnt-provided-by-my-linux-distribution).
+.NET 8.0 isn't available in the Ubuntu package repository. [Register the Microsoft package repository](../linux-ubuntu-decision.md#register-the-microsoft-package-repository) and use that feed to install .NET through APT. If you use the Microsoft package repository to install .NET, you should deprioritize .NET packages from the Ubuntu repository. For more information, see [I need a version of .NET that isn't provided by my Linux distribution](../linux-package-mixup.md?pivots=os-linux-ubuntu#i-need-a-version-of-net-that-isnt-provided-by-my-linux-distribution).

docs/core/install/includes/linux-ubuntu-feed-sdk-note.md

@@ -7,4 +7,4 @@ ms.custom: linux-related-content
 ---
 
 > [!IMPORTANT]
-> If you're using .NET 8 SDK and Ubuntu 22.04, understand that SDK versions offered by Canonical are always in the [.1xx feature band](../../versions/index.md#versioning-details). If you want to use a newer feature band release, use the [Microsoft feed to install the SDK](../linux-ubuntu.md#register-the-microsoft-package-repository). Make sure you review the information in the [.NET package mix ups on Linux](../linux-package-mixup.md?pivots=os-linux-ubuntu#whats-going-on) article to understand the implications of switching between repository feeds.
+> If you're using .NET 8 SDK and Ubuntu 22.04, understand that SDK versions offered by Canonical are always in the [.1xx feature band](../../versions/index.md#versioning-details). If you want to use a newer feature band release, use the [Microsoft feed to install the SDK](../linux-ubuntu-decision.md#register-the-microsoft-package-repository). Make sure you review the information in the [.NET package mix ups on Linux](../linux-package-mixup.md?pivots=os-linux-ubuntu#whats-going-on) article to understand the implications of switching between repository feeds.

docs/core/install/includes/linux-ubuntu-package-feed-both.md

@@ -6,4 +6,4 @@ ms.topic: include
 ms.custom: linux-related-content
 ---
 
-.NET is available in the Ubuntu package manager feeds, as well as the Microsoft package repository. However, you should only use one or the other to install .NET. Microsoft recommends that you use the Ubuntu package manager feeds. If you want to use the Microsoft package repository, see [How to register the Microsoft package repository](../linux-ubuntu.md#register-the-microsoft-package-repository).
+.NET is available in the Ubuntu package manager feeds, as well as the Microsoft package repository. However, you should only use one or the other to install .NET. Microsoft recommends that you use the Ubuntu package manager feeds. If you want to use the Microsoft package repository, see [How to register the Microsoft package repository](../linux-ubuntu-decision.md#register-the-microsoft-package-repository).

docs/core/install/includes/linux-ubuntu-package-feed-ms.md

@@ -6,4 +6,4 @@ ms.topic: include
 ms.custom: linux-related-content
 ---
 
-The default Ubuntu package repository doesn't contain this version of .NET. Use the [Microsoft package repository instead](../linux-ubuntu.md#register-the-microsoft-package-repository).
+The default Ubuntu package repository doesn't contain this version of .NET. Use the [Microsoft package repository instead](../linux-ubuntu-decision.md#register-the-microsoft-package-repository).

docs/core/install/index.yml

@@ -60,7 +60,7 @@ landingContent:
           - text: SUSE Linux Enterprise Server
             url: linux-sles.md
           - text: Ubuntu
-            url: linux-ubuntu.md
+            url: linux-ubuntu-decision.md
 
   # Card
   - title: "Q&A"

docs/core/install/linux-package-mixup.md

@@ -224,15 +224,15 @@ Configure your package manager to ignore the .NET packages from the distribution
     > ```
 
     > [!TIP]
-    > If you registered the [Ubuntu .NET backports package repository](linux-ubuntu.md#ubuntu-net-backports-package-repository) you should [unregister the Ubuntu .NET backports package repository](linux-ubuntu.md#unregister-the-ubuntu-net-backports-package-repository) instead of configuring your package manager to ignore the contained .NET packages. Otherwise your package manager pulls the package index from this repository, just to ignore it, because the repository only contains .NET packages. This effectively slows down updating your local package index every time you call `apt update`.
+    > If you registered the [Ubuntu .NET backports package repository](linux-ubuntu-decision.md#ubuntu-net-backports-package-repository) you should [unregister the Ubuntu .NET backports package repository](linux-ubuntu-decision.md#unregister-the-ubuntu-net-backports-package-repository) instead of configuring your package manager to ignore the contained .NET packages. Otherwise your package manager pulls the package index from this repository, just to ignore it, because the repository only contains .NET packages. This effectively slows down updating your local package index every time you call `apt update`.
     >
     > Use the `apt-cache policy` command to check if you registered the Ubuntu .NET backports package repository:
     >
     > ```bash
     > apt-cache policy '?name(dotnet.*)' | grep 'ppa.launchpadcontent.net/dotnet/backports' | sort -u
     > ```
 
-01. Reinstall .NET from the Microsoft package feed. For more information, see [Install .NET on Linux](linux.md). If using Ubuntu, see [My Ubuntu distribution doesn't include the .NET version I want, or I need an out-of-support .NET version](linux-ubuntu.md#my-ubuntu-distribution-doesnt-include-the-net-version-i-want-or-i-need-an-out-of-support-net-version).
+01. Reinstall .NET from the Microsoft package feed. For more information, see [Install .NET on Linux](linux.md). If using Ubuntu, see [My Ubuntu distribution doesn't include the .NET version I want, or I need an out-of-support .NET version](linux-ubuntu-decision.md#my-ubuntu-distribution-doesnt-include-the-net-version-i-want-or-i-need-an-out-of-support-net-version).
 
 ::: zone-end
 

docs/core/install/linux-scripted-manual.md

@@ -41,7 +41,7 @@ It's possible that when you install .NET, specific dependencies may not be insta
 - [Fedora](linux-fedora.md#dependencies)
 - [RHEL and CentOS Stream](linux-rhel.md#dependencies)
 - [SLES](linux-sles.md#dependencies)
-- [Ubuntu](linux-ubuntu.md#dependencies)
+- [Ubuntu](linux-ubuntu-decision.md#dependencies)
 
 For generic information about the dependencies, see [Self-contained Linux apps](https://github.com/dotnet/core/blob/main/Documentation/self-contained-linux-apps.md).