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I have currently installed Lubuntu on my old PC. It's working flawlessly so far, but I have a few questions.

I have a 160GB Hard Disk. According to Disk Utility, 159 EXT4, 1.1 GB Swap and 1.1 GB extended. Now I want to install a new OS on it. I believe it will be installed on EXT 4 and will my personal data be deleted which is on that 159 GB EXT 4 partition?

If you think that I should partition it, then how do you suggest I do and from which tool? Gparted takes a long time to load and still does not open. I don't know why.

And for example, I want to boot the .iso image from the USB and install the latest version of the current system (e.g installing Zorin OS 7.0 Lite over Zorin OS 6.2) how will it affect?

I don't want to lose my data on the hard disk. What should I do?

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unless you create another partition on 159GB so that 159GB becomes two paritions of different sizes. If you don't do this you will loose the data on that partition. –  Alvar Nov 25 '13 at 14:12
Welcome to AskUbuntu! It seems you have two questions: one referring the partitioning of your disk to install a second OS, and another regarding the upgrading of the OS. It is better to post separate questions instead of combining your questions into one. That way, it helps the people answering your question and also others hunting for at least one of your questions. Thanks! –  carnendil Nov 25 '13 at 15:30

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