@jibel done! sorry, I missed adding it earlier.

** Description changed:

+ [Impact]
+ 
+  * Currently ubiquity's prepare plugin, which installs the
+    3rd party drivers, is not run at all in automatic mode.
+    
+  * This prevents automatic installation of such drivers
+    (e.g., nvidia drivers) which are shipped / available
+    in the ISOs now; and thus could actually be installed.
+ 
+  * That causes additional network bandwidth consumption
+    or additional steps to install them in offline cases.
+    
+ [Fix]
+ 
+  * The MR allows the prepare plugin to run in automatic
+    mode unconditionally in Hirsute and later, and Focal
+    gets the 'ubiquity/prepare_automatic' preseed option
+    to enable it (so not to change the default behavior.)
+ 
+  * Now users can use the existing 'ubiquity/use_nonfree'
+    preseed option to install 3rd party drivers while in
+    automatic mode (i.e., with the 'automatic-ubiquity'
+    option, or running 'ubiquity --automatic'.)
+ 
+ [Test Case]
+ 
+  * Boot the live installer with the 'automatic-ubiquity'
+    option, or run 'ubiquity --automatic' in the shell.
+    
+  * Check whether the 'Updates and other software' page
+    is listed or not.
+    - Before: it is not.
+    - After: 
+      - Hirsute: it is.
+      - Focal: according to 'ubiquity/prepare_automatic'.
+      
+  * The page can be automatically configured via preseed
+    options, and be skipped with the key preseed option
+    'ubiquity/use_nonfree'.
+ 
+  * Then 3rd party drivers should be installer or not
+    according to the option value and system hardware.
+ 
+ [Where problems could occur]
+ 
+  * Automatic installations that didn't configure the
+    'ubiquity/use_nonfree' option configured will now
+    block in the 'Updates and other software' page,
+    waiting for input (in Hirsute and later) and thus
+    need to have their preseed file/options updated.
+    
+  * In Focal that behavior doesn't change by default,
+    and the users have to opt-in with the new option
+    'ubiquity/prepare_automatic', so they are already
+    updating the preseed file/options.
+ 
+  * If there are any existing problems in the prepare
+    plugin, they may now be exposed in automatic mode.
+    However, since it runs by default in manual Desktop
+    installs it's not expected to have any known issues.
+ 
+  * If issues happen with the option enabled in Focal,
+    users can opt-out with the new preseed option; and
+    in Groovy (where it's not available), bug reports
+    on it before release may be reported and addressed.
+ 
+ [Other Info]
+  
+  * Hirsute and Focal are patched; Groovy is not because
+    there are no more Desktop ISO spins planned (standard
+    release) thus this patch is not effectively used on G.
+ 
+ [Original Description]
+ 
  Currently the prepare plugin is just not run at all in automatic mode.
  
  But some users could benefit from it now that the ISOs ship with
  e.g., nvidia drivers, to install 3rd party drivers automatically
  during install, and not consume network bandwidth to download it.
  
  The MR introduces the 'ubiquity/prepare_automatic' preseed option
  to allow the prepare plugin to run in automatic mode (i.e. with
  the 'automatic-ubiquity' option / ubiquity --automatic)

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https://bugs.launchpad.net/bugs/1895351

Title:
  prepare plugin does not run in automatic mode

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