install failed with encrypted disk

[Henrik Lohse]

Followed these steps to create a encrypted disk installation
https://help.ubuntu.com/community/Full_Disk_Encryption_Howto_2019

Fails to install grub, with no useful information. This is a fatal error.
Installing on a dell latitude notebook e5570 from usb stick and doing a complete format of /dev/sda, a 512gb ssd.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.15.2
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.4
Architecture: amd64
CasperMD5CheckMismatches: ./pool/main/g/grub2/grub-efi-amd64_2.04-1ubuntu26.2_amd64.deb
CasperMD5CheckResult: skip
CasperVersion: 1.445.1
Date: Mon Dec 14 12:52:05 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Henrik Lohse (hennito)]

The issue was the step
# while [ ! -d /target/etc/default/grub.d ]; do sleep 1; done; echo "GRUB_ENABLE_CRYPTODISK=y" > /target/etc/default/grub.d/local.cfg

was not started in time.

After doing it again it worked.