Ok, can you follow the "Boot Options" instructions from https://wiki.ubuntu.com/DebuggingKernelBoot and capture the messages? May be that will help pointing the cause of the boot failure.
Ok, can you follow the "Boot Options" instructions from https:/ /wiki.ubuntu. com/DebuggingKe rnelBoot and capture the messages? May be that will help pointing the cause of the boot failure.