16.04 - No option to boot Ubuntu in GRUB

let me first say, I'm am recently learning ubuntu. I had it install and everything was fine. I was trying to find a file that udev should have generated but could not find it. I ,dumbly, uninstalled udev and broke stuff. To fix it I ran sudo apt-get -f upgrade . Which did nothing really but let me reinstall udev. Once installed I looked for the file and didn't see it. I thought that mabey if I restart the laptop it will generate. Well, it booted up in memtest86 what ever that was and I spamed the escape key until I left memtest, restarted PC, booted to grub loader and in the grub the only options have to boot from are memtest86 and memtest terminal. No ubuntu option. It's still there though, I booted from a live disk and looked and all of my files are still there. How do I run a system repair or something to let me boot back to it?