Can't boot my pc after installation

[nnnnadia]

Hi everyone, I'm having a weird problem... After I installed Ubuntu and restarted all boot options disappeared, but the UEFI Onboard LAN IPv4 and IPv6. I have installed Ubuntu other times, I don't think I did nothing extraodinary this time. I'm using a Dell Inspiron 15R, I ran the Dell diagnostics and is not a hardware problem. Sorry about the few amount of information, but I really have no idea of what happen.

[TheFu]

Please run the boot info script or try to use boot-repair which will generate a URL with important data needed to help. There are lots and lots of posts here with a similar issue that have 5+ links to background knowledge and repair methods.

The information gathering and sharing are critical to knowing what the issue might me.