Comment 14 for bug 1794922

Sorry Walter, I should have updated with info from
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795092

the xubuntu 18.10 x86 has the same (or very similar) messages, but they stop far sooner, and xubuntu drops to busybox/initramfs with an error.

I was asked by jsalisbury to do a test; which I think proves the kernel is okay.

From #1795092 bug comment #13 follows
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installed lubuntu 18.04.1 on dell 755 without updates, format of /, but used my old /home (from fedora). rebooted post install, pointed sources to my ISP's ubuntu mirror (bandwidth free updates) & dist-upgrade. I added xubuntu-desktop & some of the apps missing from my modified xfce desktop.

added canonical kernel ppa; changed [ppa] source to point to cosmic; update & install kernel. reboot & login (normally!)

guiverc@755-lubu:~$ screenfetch -n
 guiverc@755-lubu
 OS: Ubuntu 18.04 bionic
 Kernel: x86_64 Linux 4.18.0-8-generic
 Uptime: 10m
 Packages: 1678
 Shell: bash 4.4.19
 Resolution: 1680x1050
 DE: XFCE
 WM: Xfwm4
 WM Theme: Agualemon
 GTK Theme: Mist [GTK2]
 Icon Theme: gnome
 Font: Sans 10
 CPU: Intel Core2 Duo E6850 @ 2x 2.71GHz
 GPU: ATI RV515
 RAM: 477MiB / 4824MiB

// in #14 from same bug report I booted xubuntu 18.10 (x86) live on same dell 755; it still has

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