Are you sure?
You will lose data by performing a workstation installation.
This class of installation will remove ALL data on ALL existing Linux partitions on ALL disk drives.
If you want to preserve data on existing Linux partitions, you should choose to partition manually or choose a custom-class installation.
Use the Back button to choose a custom-class installation, or choose Next if you want to proceed with a workstation-class installation.
If you would like to partition manually, you can choose either the Disk Druid or fdisk (experts only) partitioning tool.