[Bug 1945062] Re: grub-installer crashes during installation of Ubuntu on lvmraid (2 SATA). There is an ITE8212, also

[Stefano Lodi]

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 /

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https://bugs.launchpad.net/bugs/1945062

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

Status in grub-installer package in Ubuntu:
  New

Bug description:
  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)

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