Boot menu not showing

[Renold00]

Hello dear community members,

   I have a problem in my laptop. I was using windows 10 in my laptop and recently I have installed Ubuntu 20.04 lts version and now the problem begins.

1) I'm not able to boot up Ubuntu because it stuck at black screen with a horizontal cursor top left of the screen at starting.

2) I'm not able to reinstall windows because when I put my bootable pendrive boot menu doesn't show after pressing f9 key.

 Pls help.

[WAWood]

@Renold00 

I'm sorry, but HP only warranties their PCs for usage with the OS that comes preinstalled.

IF you replace that with a Linux distro, or add a Linux distro, then you assume full responsibility for maintaining that -- including solving any problems with booting the other OS and/or installing the other OS.

Your best bet for support with issues with Linux is to contact the support forum of the distro you are using.

Since you are using Ubuntu, go here: https://ubuntuforums.org/

Good Luck