Tripple boot help

I’ve installed opensuse tumbleweed at my hp probook in dual boot with windows10. Than, I noticed some bugs in opensuse and decided to try Ubuntu 18.04. So after Ive installed the Ubuntu the opensuse doesn’t show up in the boot options anymore.

Then, I searched for help and found out that I should run some sudo grub-something (don’t remember what) and the grub.cfg was rebuilt and then opensuse started appearing on boot. But when I choose opensuse from boot menu I get an error saying

cannot find vmlinuz-5.1.4….Need to load kernel first

I tried searching everywhere but have no luck, so I’m here to get a little help. If you need more details, please, let me know.