This bug was fixed in the package grub2 - 2.02+dfsg1-12ubuntu2.1
---------------
grub2 (2.02+dfsg1-12ubuntu2.1) disco; urgency=medium
* Apply patch from Peter Jones to forbid the "devicetree" command when
Secure Boot is enabled. (LP: #1851897)
-- dann frazier <[email protected]> Sun, 10 Nov 2019 11:17:51 -0700
** Changed in: grub2 (Ubuntu Disco)
Status: Fix Committed => Fix Released
** Changed in: grub2-signed (Ubuntu Disco)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1851897
Title:
devicetree command should be disabled in Secure Boot mode
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