Grub2 Can't install on /dev/sda

[Liang Kang]

I wonder if this problem is associated with my hardware. (Sorry for my poor writing)
I'm using Lenovo ideapad320-14iap, when I trying to install Ubuntu, I always meet the problem of the grub2.

When the Ubuntu 19.04 is the installed version, I got lots of error code (eax, etc.) that seemed about the cpu and said "Kernel Panic"

When the Ubuntu 19.10 Daily Build is the installed version, I did not get the long error output but get the error line, as the "Shim" was installing , I got a message "Grub can't install on /dev/sda"

IF I ADD THE ARGUMENT "--no-bootloader" AND INSTALL GRUB MANUALLY, I WON'T GET ANY ERROR ABOUT THE BOOTLOADER

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: ubiquity 19.10.8
ProcVersionSignature: Ubuntu 5.2.0-8.9-generic 5.2.0
Uname: Linux 5.2.0-8-generic x86_64
ApportVersion: 2.20.11-0ubuntu7
Architecture: amd64
CasperVersion: 1.414
Date: Thu Aug 8 16:38:00 2019
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed quiet splash ---
LiveMediaBuild: Ubuntu 19.10 "Eoan Ermine" - Alpha amd64 (20190802)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)