multiple wont install correctly

[Roberta Holmes]

HP ENVY 17-2280 I7 16GB memory, 2 x 500 mb hard drives in 1TB raid configuration. Started with the DVD ISO and installed with the existing win7 installation.Seems to be having issues at the
very end of the install process. Was going to attempt deleting the win7 partitions and allocating the complete drive to Ubantu.But this is my last resort. I would just like to know what is causing this issue.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.15.17
ProcVersionSignature: Ubuntu 5.11.0-27.29~20.04.1-generic 5.11.22
Uname: Linux 5.11.0-27-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckMismatches: ./dists/focal/main/binary-amd64/Packages.gz
CasperMD5CheckResult: skip
CasperVersion: 1.445.1
Date: Wed Jan 12 19:57:31 2022
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed initrd=/casper/initrd quiet splash --- maybe-ubiquity
LiveMediaBuild: Ubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Erich Eickmeyer (eeickmeyer)]

Thank you for taking the time to make Ubuntu better. The following was provided in your description:

CasperMD5CheckMismatches: ./dists/focal/main/binary-amd64/Packages.gz
CasperMD5CheckResult: skip

This means that there may have been a bad download or write to media which caused this error. We understand the difficulty you are having, but we recommend downloading the .iso image and writing to media again.