Zend certified PHP/Magento developer

Ubuntu break after upgrading from Ubuntu 22.04 LTS to Ubuntu 23.10

I was trying to upgrade my Ubuntu 22.04 to Ubuntu 23.10 using
do-release-upgrade.
After changing Prompt=normal, the installation happened fine, and then it prompted to
remove the unused files. I pressed 'y', and then it required a restart. After the restart, there is no more Ubuntu in the GRUB bootloader.

Is there any way I can fix it