I have been running Ubuntu 16.04 LTS in 4 partitions. Partition 1 Boot Partition 2 System Partition 3 Home Partition 4 Swap
I have a boot-able DVD.
Question? How can I reinstall the boot and system partition without disturbing my Home partition?
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Ubuntu has a choice to install with manual partitioning (something else)... (You possibly used it to create the current system [or someone else did it for you]).
When you chose manual partitioning, you have the option to format, or to not format the partition (there you have to chose "Don't format" and "use as /home").
Everything else is a normal installation process.