Ubuntu
subiquity package

Encrypted LVM on UEFI prevents GRUB booting successfully

Bug #1901488 reported by TJ
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This bug affects 1 person
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subiquity (Ubuntu)
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Bug Description

20.04.1 Encrypted LVM install, sda4 > LUKSv2 > VG > LVs

cryptsetup creates LUKSv2 containers. GRUB can only understand LUKSv1 and therefore cannot access its root device making the installation unbootable.

Making matters worse, installer has not added GRUB_ENABLE_CRYPTODISK=y to /etc/default/grub.d/local.cfg so grub-install hasn't passed the crypto device info to GRUB's core and thus there is no cryptomount command in /EFI/ubuntu/grub.cfg

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