Installing grub2 failed and installation closes.

[Kevin Crans]

I installed Kylin 20.04 2 times, both times the setup encountered an error, thatś probably unrelated. both times, after entering the wpa2 wifi password, it remained unclear whether I was connected. After booting for the first time, the screen goes black having turned on auto-login. second time, the installation gets an error and closes turning me here. This happened after installing grub2 failed. It's Ubuntu kylin 20.04 enhanced iso.

ProblemType: Bug
DistroRelease: Ubuntu Kylin 20.04
Package: ubiquity 20.04.9 [origin: Ubuntu]
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
ApportVersion: 2.20.11-0ubuntu21
Architecture: amd64
CasperVersion: 1.442
Date: Sun Apr 12 08:12:42 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz locale=zh_CN keyboard-configuration/layoutcode?=cn file=/cdrom/preseed/ubuntu.seed only-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu-Kylin 20.04 LTS "Focal Fossa" - Beta amd64 (20200401)
ProcEnviron:
 LANGUAGE=en_US.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 LC_NUMERIC=C.UTF-8
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Kevin Crans (kevincrans)]

Thank you all!