This bug was fixed in the package intel-microcode -
3.20200609.0ubuntu0.20.04.1
---------------
intel-microcode (3.20200609.0ubuntu0.20.04.1) focal-security; urgency=medium
* REGRESSION UPDATE: some CPUs in the Skylake family sig=0x406e3
fail to boot (LP: #1882890).
- revert 06-4e-03/0x000406e3 microcode from 0x00dc to 0x00d6
sig 0x000406e3, pf_mask 0xc0, 2019-10-03, rev 0x00d6, size 101376
-- Steve Beattie <[email protected]> Wed, 10 Jun 2020 08:34:20 -0700
** Changed in: intel-microcode (Ubuntu Focal)
Status: Confirmed => Fix Released
** Changed in: intel-microcode (Ubuntu Bionic)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1882890
Title:
intel-ucode/06-4e-03 from release 20200609 hangs system in early boot
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