This has also been reported here: #1854764
fixed by upgrading to 3.20191115.1ubuntu0.19.10.2:
Published on 2019-12-04
Copied from ubuntu eoan in PPA for Ubuntu Security Proposed by Ubuntu
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Changelog
intel-microcode (3.20191115.1ubuntu0.19.10.2) eoan-security;
urgency=medium
* REGRESSION UPDATE: warm reboots cause hangs on certain Skylake
processors (LP: #1854764)
+ Reverted microcode (from revision 0x2000065):
sig 0x00050654, pf_mask 0xb7, 2019-07-31, rev 0x2000064, size 33792
-- Steve Beattie <sbeat...@ubuntu.com> Mon, 02 Dec 2019 12:15:00 -0800
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https://bugs.launchpad.net/bugs/1852837
Title:
Ubuntu 19.10 boots into blinking underscore when manually restart, not
even grub shows up!
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