Before this problem I was stuck in a grub rescue screen after trying to install puppy linux, and to fix it I used a boot rescue disc, but after using the boot rescue disc I restarted my computer and it says no operating system found, then this screen appears https://ibb.co/iAHe86 and I have no idea what to do from here. I thought the boot repair disc erased puppy linux after I installed it, so I put in a lubuntu disc and tried installing that, but while I was trying to install it, it said puppy linux was still on my computer, but I don't know how because its not booting. Does anyone know how I can get puppy linux to boot from here?
Probably the PC has a working Puppy Linux partition, but
grub somehow misconfigured itself. The usual fix is to use a BootCD to login to a terminal, do a
chroot to the Puppy partition, then reinstall the
grub boot sector.
For more details, see What's the proper way to prepare chroot to recover a broken Linux installation? and How to reinstall GRUB2 EFI?
please review this link. i guess you might find the answer.
If computer has two or more hard drives it occasionally happens that in bios / uefi the boot drive gets misconfigured (eg during installation you unplugged drives, or something else). I had this a couple of times in the past and revising boot devices and their order in bios helped.