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I am thinking like in the android phone way, you upgrade your OS but no files are gone. Is there anyway to do that??

Kishan
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Well, there isn't a need to delete files in the first place.

  • For normal users, you get a GUI dialog box pop up to ask if you want to upgrade to the newest release.

  • The command line method is sudo do-release-upgrade -d or sudo sed -i 's/raring/saucy/g' /etc/apt/sources.list; sudo apt-get update; sudo apt-get upgrade -y; sudo apt-get dist-upgrade -y.

  • The CD method is simply clicking upgrade when asked how you want to install.

However, it's advisable to make a /home partition when you first install Ubuntu so you can always do a complete fresh install and still have all of your files.

mmstick
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    There's no need to create a /home partition, one can always select advanced partitioning in the installer and install Ubuntu in the existing Ubuntu partition (it'll overwrite system files but not /home) See this AU answer – Ramchandra Apte Oct 19 '13 at 06:53
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    I'd always advise backing up before an upgrade. You shouldn't lose anything but upgrades do occasionally go wrong and its much easier to fix with a backup. – Warren Hill Oct 19 '13 at 07:10