Failure of reboot after update

[Jim Croft]

I am running Kubuntu 16.04 on a Toshiba Satellite E55t-A5320 series computer.

The last two updates, when prompted to reboot, I clicked on the prompt and the reboot failed. The computer froze on the initial Toshiba banner page which is supposed to allow access via F2 to Setup Utility or by F12 to Boot Manager. The first time this happened, I tried to boot from a thumb drive. The computer gave a <Boot Failed> message, but when I attempted a normal boot, it worked, and continued to work, through several reboots, for several days. However, the next time I updated, and clicked the reboot prompt, the reboot again failed, and the previous work-around did not work. The computer will not get beyond the Toshiba introductory banner described previously. Any recommendations? I am not very familiar with Kubuntu, and am only semi-literate on computers in general, so please put it in “baby talk”!
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