Your Question: Do I Need to Format Hard Drive Before Installing Ubuntu?
Contents When You Are Installing Ubuntu, at the Partitioning Step, Choose Use Entire Harddisk, and Ubuntu Will Format the Entire Harddisk for You, Also...
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When you are installing Ubuntu, at the partitioning step, choose Use entire harddisk, and Ubuntu will format the entire harddisk for you, also creating a swap partition.
Can you install Ubuntu without formatting?
Of course you can. You just have to select the manual partitioning method and tell the installer not to format any partition you want to use.
What format is needed for Ubuntu?
A Note about File Systems:
Drives that are going to be used only under Ubuntu should be formatted using the ext3/ext4 file system (depending on which version of Ubuntu you use and whether you need Linux backwards compatibility).