The previous Linux is overwritten in Grub after installing the 2nd Linux. Thank you for your help. How to fix?

Question

linux

Good day everyone Thank you for your help
Bottom line:
- Installed Windows
- Then installed Kali Linux using dm-crypt LVM (boot-unencrypted)
- Then installed Ubuntu: Created unencrypted (normal) partitions for Ubuntu: swap, home, root , and boot
As a result: - Ubuntu is successfully installed, in Grub I see only Ubuntu and Windows. Kali is gone.
Question: - How to correctly install 2 Linux distributions?
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(I created 2 separate /boot, and wrote to 1 /boot partition. The result is the same. The previous version of Linux is overwritten all the time)
Maybe Do I need to manually edit something?
Thanks again for your help

Answer 1

Have you tried running update-grub on first boot on a freshly installed Linux? Maybe there is a bug in the installer, and he only sees himself from Linux systems. If it helps, file a bug report and have them fix it.