in between installation a fatal error came

[saurabh tiwari]

while installing one fatal error was reported

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.15.10
ProcVersionSignature: Ubuntu 5.8.0-43.49~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-43-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.445.1
CurrentDesktop: ubuntu:GNOME
Date: Thu Jun 3 12:44:41 2021
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
ProcEnviron:
 LANGUAGE=en_IN
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_IN
 LC_NUMERIC=C.UTF-8
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Seth Arnold (seth-arnold)]

Thanks for taking the time to report this bug and helping to make Ubuntu better. We appreciate the difficulties you are facing, but this appears to be a "regular" (non-security) bug. I have unmarked it as a security issue since this bug does not show evidence of allowing attackers to cross privilege boundaries nor directly cause loss of data/privacy. Please feel free to report any other bugs you may find.

[Seth Arnold (seth-arnold)]

Here's the part of the logs that feels most relevant to me:

Jun 3 07:13:05 ubuntu ubiquity: Preparing to unpack .../shim_15+1552672080.a4a1fbe-0ubuntu2_amd64.deb ...
Jun 3 07:13:05 ubuntu ubiquity: Unpacking shim (15+1552672080.a4a1fbe-0ubuntu2) ...
Jun 3 07:13:05 ubuntu ubiquity: Selecting previously unselected package shim-signed.
Jun 3 07:13:05 ubuntu ubiquity: Preparing to unpack .../shim-signed_1.40.4+15+1552672080.a4a1fbe-0ubuntu2_amd64.deb ...
Jun 3 07:13:05 ubuntu ubiquity: Unpacking shim-signed (1.40.4+15+1552672080.a4a1fbe-0ubuntu2) ...
Jun 3 07:13:05 ubuntu ubiquity: Setting up shim (15+1552672080.a4a1fbe-0ubuntu2) ...
Jun 3 07:13:05 ubuntu ubiquity: Setting up shim-signed (1.40.4+15+1552672080.a4a1fbe-0ubuntu2) ...
Jun 3 07:13:13 ubuntu grub-installer: info: Installing grub on '/dev/sda'
Jun 3 07:13:13 ubuntu grub-installer: info: grub-install does not support --no-floppy
Jun 3 07:13:13 ubuntu grub-installer: info: Running chroot /target grub-install --force "/dev/sda"
Jun 3 07:13:13 ubuntu grub-installer: Installing for x86_64-efi platform.
Jun 3 07:13:17 ubuntu kernel: [ 631.110840] FAT-fs (sda2): error, fat_free_clusters: deleting FAT entry beyond EOF
Jun 3 07:13:17 ubuntu kernel: [ 631.110847] FAT-fs (sda2): Filesystem has been set read-only
Jun 3 07:13:17 ubuntu kernel: [ 631.114574] grub-install[29841]: segfault at 0 ip 00007fbdb21df4a5 sp 00007ffd8486f410 error 4 in libc-2.31.so[7fbdb217e000+178000]
Jun 3 07:13:17 ubuntu kernel: [ 631.114587] Code: 00 00 00 66 90 f3 0f 1e fa 41 57 41 56 41 55 41 54 49 89 f4 55 4c 0f af e2 53 48 83 ec 08 4d 85 e4 0f 84 e7 00 00 00 48 89 d5 <8b> 11 49 89 fe 49 89 f5 48 89 cb 81 e2 00 80 00 00 75 3d 48 8b b9
Jun 3 07:13:17 ubuntu grub-installer: error: Running 'grub-install --force "/dev/sda"' failed.
Jun 3 07:14:06 ubuntu systemd[1]: zsysd.service: Succeeded.
Jun 3 07:14:11 ubuntu ubiquity[2146]: Reverting lockdown of the desktop environment.