1) I cannot tell which update caused this.

2) Not sure how to boot to previous kernels, especially not wanting to
fowl up my settings.

3) roger@roger-desktop:~$ sudo apt-get install --install-recommends 
linux-generic-hwe-16.04 xserver-xorg-hwe-16.04 
[sudo] password for roger: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
linux-generic-hwe-16.04 is already the newest version (4.13.0.43.62).
xserver-xorg-hwe-16.04 is already the newest version (1:7.7+16ubuntu3~16.04.1).
The following packages were automatically installed and are no longer required:
  libqmi-glib1 libqpdf17 python3-notify2 python3-pexpect python3-pil
  python3-ptyprocess python3-pyqt4 python3-renderpm python3-reportlab
  python3-reportlab-accel python3-sip
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
roger@roger-desktop:~$ 

Or do you mean results as to boot with no problems?  - No change to that
on earlier experience, but now after additional other updates, and using
Xdiagnose with various settings, I haven't seen a boot problem for a few
updates.  I will continue to monitor for a few days to assure that
problem is really gone.

In retrospect, it appears likely to me that there was a borderline
timing problem in the boot sequence, and something in the meantime
(almost daily updates, or ???) may have changed that, or maybe I've just
been lucky the past 8 or 10 tries.  Continued watching is appropriate.

Also, the command " sudo apt-get install --install-recommends linux-
generic-hwe-16.04 xserver-xorg-hwe-16.04 "  actually causes a problem in
my system.  It sets and locks the theme to Ambiance, even though the
setting properly shows Adwaita.  It will not allow the theme to be reset
until I reboot into Unity desktop which then allows it to reset properly
to Adwaita.  I don't know if this is a bug, or just the way it works for
diagnostic purposes.  If it's just the way it works, it should be
described in the documentation along with the fix.  If it's a bug, I'll
leave it to others for now.

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https://bugs.launchpad.net/bugs/1772386

Title:
  message - Low Graphics mode - about 2/3 of startups - not all

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