![]() Every Ubuntu ISO contains a few “manifest” files. Now the question is: why do we need the ISO again? The answer is simple, we need a way to find out what packages were shipped by default. Otherwise you will have to download a fresh ISO from distribution’s website. ![]() ![]() If you have an installation image stored somewhere or have access to previously made installation media, it will do the job. To find and install missing default packages, you will need the installation ISO image, again. ![]() Installing Missing Packages Shipped with the OS Both these methods have some caveats though, which are explained below. This tutorial will explain both methods, the first one will work with Ubuntu and all of its derivatives while the second one will only work with Ubuntu and other GNOME based derivatives like Ubuntu MATE. Restoring Ubuntu to factory state can mainly be broken into two parts: finding and installing any missing software shipped with the OS and reverting the desktop to default settings. However there are unofficial ways to do this on Ubuntu, though these methods are not as effective as Windows’ implementation. Ubuntu in particular doesn’t have an official way to reset the OS to default state, unlike Windows 10 which comes with a recovery partition or external recovery drive. Things going awry during code compilation, installation of dependencies, installation of third party packages or manual editing of configuration files is not unheard of. If you are a Linux user, chances are that you may have broken your distribution’s operating system (OS) at some point of time.
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