I took an update from 4.15.0.33 to 4.15.0.34. My machine would not boot from the new kernel. I tried removing the latest kernel using: sudo apt-get purge linux-image-4.15.0.34-generic and sudo apt-get purge linux-headers-4.15.0.34-generic. It successfully remove the kernel files and "update-grub2" show two remaining kernels (4.15.0.33 and 4.4.0.121).
When I reboot the machine continues to try and boot 4.15.34. How do I really kill it? In my messing around I can only successfully boot 4.4.0.121 now. How do I get things back to normal?