Comment 41 for bug 1777378

Other than the aforementioned hardware experimentation, you might also want to try downgrading the kernel. Older kernels are likely still installed on your machine so all you need is to get to the grub menu (which can be difficult) and choose an older kernel at boot time.

See: https://askubuntu.com/questions/16042/how-to-get-to-the-grub-menu-at-boot-time