I am using Ubuntu 18.04 64-bit as my main OS on my HP laptop. I recently installed Phoenix-OS in dual-boot, but when I boot up my laptop the GRUB screen for OS selection is not showing. It boots into a purple screen which I believe is the GRUB menu, but there is nothing written on it or any options shown. This screen keeps showing for the exact amount of time I selected in GRUB customizer.
What can I do to get the proper GRUB menu?
Edited: So apparently, the grub decided to show up randomly when I click esc, but I can't do anything, the only key is esc, and I click it, "Minimal BASH-like editing is ......." show up with a kind of a terminal "grub>". Now how can I resolve my issue ?