The latest Ubuntu release has a bug in the Intel SPI driver in the Linux kernel that seems to be corrupting UEFI firmware on certain Lenovo and Acer laptops leaving users with no options to change UEFI settings or select an alternative boot method.
https://www.notebookcheck.net/Ubuntu-17-10-Artful-Aardvark-burrows-into-PC-BIOSs-causing-boot-issues.274898.0.html