After I upgrade,do I again need to configure wireless and Bluetooth?all the installed Software will be there or again I have to download and install?
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Nope! It's simply there already (So long as you do it properly via the builtin command/gui) – Grammargeek Jul 05 '15 at 02:18
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Upgrading your existing system will generally keep all your drivers, applications, files and settings. If you do a clean install, then you will need to re-install everything.
kp91
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You should always backup your data before upgrading your Ubuntu operating system. You can also backup the whole system depending on what is important to you.
A correct upgrading will keep however your other settings as they are.
I think these answers will be helpful for you to read them before upgrading.
