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Ever since Hardy (Ubuntu 8.04) you can reinstall Ubuntu without losing data in /home even without a separate /home partition. Since Hardy, Ubuntu can be reinstalled while preserving home even without separate /home: see UbuntuReinstallation. Of course, you should always have a backup of your data.
How do I reinstall Ubuntu and keep my data and settings?
Reinstall Ubuntu, but keep personal data
Step 1) First step is to create an Ubuntu Live DVD or USB drive, which will reinstall Ubuntu. Head over to our detailed guide and return with an Ubuntu Live DVD/USB drive. Step 2) Boot your computer into the Ubuntu Live disk. Step 3) Select “Install Ubuntu”.
How do I reinstall Linux without losing data?
AFTER you have made a backup, do a fresh install.
- Install the system to /dev/sda1 , with mountpoint / as shown on your screenshot.
- Select mountpoint /home for /dev/sda5 and DO format the drive.
- After the install is finished, copy back your files from your backup to your new home.
