Comment 93 for bug 1779827

Easiest thing to do is just delete the .24 kernel. During boot, start tapping the esc key repeatedly. You should get the grub menu. Select the advanced option, and then load the last good kernel, which should be the .23 one if you've kept the system up to date. Once it boots and everything is working right, you can use your package manager to remove the offending .24 kernel or do it manually with sudo apt remove <kernel name>. Once you've removed it, grub will automatically be updated so it will boot to the .23 kernel. FWIW, the .24 kernel was removed from the repo as to not to infect people that do updates now.