grub-installer crashes during installation of Ubuntu on lvmraid (2 SATA). There is an ITE8212, also

[Stefano Lodi]

I'm trying to install Ubuntu on a software raid, using two SATA disk and lvm. Installed Lubuntu and Openmandriva on a ITE8212 without problem.
The first try using mdadm, fail.
The second using lvm, probabily suffer for a non-proper clean system. I think somewhat on devicemap or grub or udisk...
Now, the installation DVD is in, I'll try a reboot. Good luck for me!

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.15
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux 5.4.0-26-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CasperVersion: 1.445
Date: Sat Sep 25 18:04:02 2021
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed initrd=/casper/initrd quiet splash --- maybe-ubiquity
LiveMediaBuild: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Stefano Lodi (stlod1961)]

new test: from lvm2 I delete all LV, VG and PV. Using disk, erase all partition on 2 SATA2 hard-disk, then reformatting (sda, sdb) with no filesystem. Reboot the system (Lubuntu on sdc -an hardware RAID IT8212).
Using lvm I create 2 PV and 1 VG using maximum size. Then I create a LV RAID0 64G 2stripe, 512K stripesize.
Using DVD live for Ubuntu 20.4.3 I install a new system still on the LV RAID0. Installation is ok, but impossible install GRUB on sdc or LV RAID0, the button is grayed out. Permit sda,sdb or sdc2 ( a partition into IT8212, flagged bootable).
Grub in sda or sdb end in a busybox, in sdc2, can't recognize the new system. Null happen using Grub customizer from Lubuntu. In Internet I can't find update information about how grub access RAID0. Somebody tells that automagically must config and load the necesary modules for achieve the goal. Not in this case.
Have a nice day
next test: a linear LV for /boot and LVraid0 for /