This bug was fixed in the package partman-auto - 134ubuntu10
---------------
partman-auto (134ubuntu10) cosmic; urgency=medium
* recipes-amd64-efi/*: enforce creating ESP on a primary partition, as
efibootmgr fails to create correct (nested) logical MBR parition
bootentries as per UEFI spec. LP: #1796260
-- Dimitri John Ledkov <[email protected]> Tue, 16 Oct 2018 17:03:15
+0100
** Changed in: partman-auto (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1796260
Title:
UEFI install onto an MBR disk, with a pre-existing os/partition,
results in a non-bootable ESP on a logical partition
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