Reword ubuntu setup instructions (#690)

* Reword Ubuntu setup instructions

* Get rid of simply, as it might sound snarky and make sure people understand that they need the terminal

data/distro.yml

@@ -3,19 +3,19 @@
   steps:
     - name: Install Flatpak
       text: "
-        <p>To install Flatpak on Ubuntu 18.10 (Cosmic Cuttlefish) or later, simply run:</p>
+        <p>To install Flatpak on <strong>Ubuntu 18.10 (Cosmic Cuttlefish) or later</strong>, open the Terminal app and run:</p>
         <terminal-command>sudo apt install flatpak</terminal-command>
-        <p>With older Ubuntu versions, the official Flatpak PPA is the recommended way to install Flatpak. To install it, run the following in a terminal:</p>
+        <p>For older versions <strong>up to Ubuntu 18.04 LTS (Bionic Beaver)</strong>, the official Flatpak PPA is required to install Flatpak and keep it up to date. To add the PPA and install Flatpak, open the Terminal app and run:</p>
         <terminal-command>
           sudo add-apt-repository ppa:flatpak/stable\n
           sudo apt update\n
           sudo apt install flatpak\n
         </terminal-command>"
-    - name: Install the Software Flatpak plugin
-      text: "
-        <p>The Flatpak plugin for the Software app makes it possible to install apps without needing the command line. To install, run:</p>
+    - name: Install GNOME Software Flatpak plugin
+      text: '
+        <p>The GNOME Software plugin makes it possible to install apps without needing the command line. To install, run:</p>
         <terminal-command>sudo apt install gnome-software-plugin-flatpak</terminal-command>
-        <p>Note: the Software app is distributed as a Snap since Ubuntu 20.04 and does not support graphical installation of Flatpak apps. Installing the Flatpak plugin will also install a deb version of Software and result in two Software apps being installed at the same time.</p>"
+        <p><strong>Note:</strong> Ubuntu distributes GNOME Software as a Snap in versions 20.04 to 23.04, and replaced it with App Center in 23.10 and newer—neither of which support installing Flatpak apps. Installing the Flatpak plugin will also install a deb version of GNOME Software, resulting in two "Software" apps being installed at the same time on Ubuntu 20.04 to 23.04, and a single new \"Software\" app on Ubuntu 23.10 and newer.</p>'
     - name: Add the Flathub repository
       text: "
         <p>Flathub is the best place to get Flatpak apps. To enable it, run:</p>
@@ -57,7 +57,7 @@
   steps:
     - name: Install Flatpak
       text: "
-        <p>To install Flatpak on operating systems of the Alt family, simply run:</p>
+        <p>To install Flatpak on operating systems of the Alt family, open the Terminal app and run:</p>
         <terminal-command>
           su -\n
           apt-get update\n
@@ -138,7 +138,7 @@
   steps:
     - name: Install Flatpak
       text: "
-        <p>To install Flatpak on Arch, simply run:</p>
+        <p>To install Flatpak on Arch, open the Terminal app and run:</p>
         <terminal-command>sudo pacman -S flatpak</terminal-command>"
     - name: Restart
       text: '
@@ -203,7 +203,7 @@
   steps:
     - name: Install Flatpak
       text: "
-        <p>To install Flatpak on Gentoo, simply run:</p>
+        <p>To install Flatpak on Gentoo, open the Terminal app and run:</p>
         <terminal-command>emerge --ask --verbose sys-apps/flatpak</terminal-command>"
     - name: Add the Flathub repository
       text: "
@@ -219,10 +219,10 @@
   steps:
     - name: Install Flatpak
       text: "
-        <p>To install Flatpak on Kubuntu, simply open Discover, go to Settings, install the Flatpak backend and restart Discover.</p>"
+        <p>To install Flatpak on Kubuntu, open Discover, go to Settings, install the Flatpak backend and restart Discover.</p>"
     - name: Install the Flatpak system settings add-on
       text: "
-        <p>To integrate Flatpak support into the Plasma System Settings, simply run:</p>
+        <p>To integrate Flatpak support into the Plasma System Settings, open the Terminal app and run:</p>
         <terminal-command>sudo apt install kde-config-flatpak</terminal-command>"
     - name: Add the Flathub repository
       text: "
@@ -236,7 +236,7 @@
   steps:
     - name: Install Flatpak
       text: "
-        <p>To install Flatpak on Solus, simply run:</p>
+        <p>To install Flatpak on Solus, open the Terminal app and run:</p>
         <terminal-command>sudo eopkg install flatpak</terminal-command>"
     - name: Add the Flathub repository
       text: '
@@ -300,7 +300,7 @@
   steps:
     - name: Install Flatpak
       text: "
-        <p>To install Flatpak on Pop!_OS 19.10 and earlier, simply run:</p>
+        <p>To install Flatpak on Pop!_OS 19.10 and earlier, open the Terminal app and run:</p>
         <terminal-command>sudo apt install flatpak</terminal-command>"
     - name: Add the Flathub repository
       text: