Presumably Ubuntu worked before the upgrade. Please try booting some older/newer kernels to see which if any are free from the bug:
https://kernel.ubuntu.com/~kernel-ppa/mainline/?C=M;O=D
Presumably Ubuntu worked before the upgrade. Please try booting some older/newer kernels to see which if any are free from the bug:
https:/ /kernel. ubuntu. com/~kernel- ppa/mainline/ ?C=M;O= D