I may have experienced this issue also on bionic (18.04) with the
current kernel version as of today (4.15.0-13.14).
I upgraded one affected system with "do-release-upgrade -d". After
completing the upgrade and rebooting, the system froze the same way as
with the affected 17.10 kernel and microcode combination. After adding
"apparmor=0" to the kernel command line the boot was successful. The
system has sssd.
I was not able to perform further testing today. I will try to confirm
Or maybe someone else with an affected system is able to try bionic as
well? ISOs available at http://releases.ubuntu.com/18.04/ if needed.
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intel-microcode 3.20180312.0 causes lockup at login screen(w/ linux-
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