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I have a hybrid disk drive with two partitions on it - one for windows and other for Ubuntu. I had Ubuntu 16.04 before, but since then it won't boot anymore(also won't upgrade to newer version), so I decided to install a newer 18.04.Installer gave me options to erase or install 18.04 alongside 16.04, but when I choose second option it warns me:

If you continue, the changes listed below will be written to the disks. Otherwise, you will be able to make further changes manually

The partition tables of the following devices are changed:
SCSI1 (0,0,0) (sda)

The following partitions are going to be formatted:
partition #5 of SCSI1 (0,0,0) as ESP
partition #6 of SCSI1 (0,0,0) as ext4

This message goes about /dev/sda completely and not sda2, where Ubuntu is installed. Will it interfere /dev/sda1 where windows is installed? Or corrupt Ubuntu 16.04 because of formatting?

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It is creating new partitions #5 and #6. Information about it must be written to partition table on /dev/sda.

It is not going to change sda2 or sda1.

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