found my xubuntu 18.10 daily image iso (updated this morning 2018-10-04 is date 
found in zsync)
xubuntu plymouth screen, ctrl-alt-f2 & scrolling

[     99.999999]  ehci-pci 0000:00:1a.7:dma_direct_map_sg: overflow
0x000000016cbe60000+2048 of device mask ffffffff

and eventually

---
[      9.570802] sd 8:0:0:0: [sdb] No Caching mode page found
[      9.570846] sd 8:0:0:0: [sdb] Assuming drive cache: write through

"BusyBox v1.27.2 (Ubuntu 1:1.27.2-2ubuntu4) built-in shell (ash)
Enter 'help' for a list of built-in commands

(initramfs) Unable to find a medium containing a live file system
[  234.592022]  usb 4-1:device descriptor read/64, error -110
[  240.353082]  usb 4-1:device descriptor read/8m error -110
// three more usb 4-1 messages
...             usb  usb4-port1: unable to enumerate USB device

// the usb messages I ignore; they appeared when I started using a cheap powered
// hub which is always connected ; occurred on fedora (now gone) & opensuse
// on ctrl-alt-f2 or text screen there were more usb messages I ignore
// also note I'm keying this text in on nearby desktop; typos may exist.

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https://bugs.launchpad.net/bugs/1795092

Title:
  xubuntu 18.10 daily image (x86) fails to boot - initramfs

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