dual boot – Grub menu not showing OS names after installing 3rd os

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siva surya’s answer solved the issue. askubuntu.com/a/1134107/1370321%5B1%5D

However, additionaly, i had to do some other stuff.
since we’ve installed ubuntu on SSD, the grub is now confused between the previous installed ubuntu on HDD, and new installed ubuntu on SSD. (we have to change BIOS setting (later)).

Follow the steps of using a bootabe USB to get into ubuntu. use boot-repair. Till this part its same.

Next, while boot-repair is ongoing, do use the advanced options:
opt for boot from HDD, instead of boot from SSD.

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