I found a BIOS update, to 2.06, and flashed it. Problem has gone away, at least for the new installation.
Sigh. I marked the bug report invalid. Thanks for your patience. ** Changed in: linux (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1838050 Title: Kernel panic at 4.8 sec into boot Status in linux package in Ubuntu: Invalid Bug description: Clean install from just-downloaded (24 July 2019) xubuntu 18.04.2 LTS. Shuttle XH110V. 32GB, 4T. UEFI. Since it does not boot I can't give you anything from the crashed system. I attach a picture of the screen at the crash. BTW, this started when the Software Updater installed 4.15.0-55 the other day. Before that, the system was happy. The crash then was quicker, about 1.5 sec. I couldn't see enough to look at the beginning of the crash stuff because the text on the screen was large enough it pushed early crash info off the top. So far I've spent more than two days trying to get my box running again. Help! To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1838050/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp