[Bug 1931013] [NEW] errno5 installing with usb flash

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i got the Ubuntu 20.04.2.0 LTS on ubuntu download website, got it on a usb flash drive with rufus as per advised on :
https://ubuntu.com/tutorials/create-a-usb-stick-on-windows#2-requirements

and i get that errno 5 error message

the installer encountered an error  copying files to the hard disk:
something to do with disk cleaning up, or running in cooler place, or burn the cd at lower speed... but im on a flash drive ! i dont burn anything, my computer is idle and not running hot... 
pc is  about 4 years old, 8gb ram, was wiped and rebooted a week ago and all updated so no cobwebs in there.
 this is the second time im trying... dunno what to do, im not IT savvy?!?!

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
CasperMD5CheckMismatches: ./casper/filesystem.squashfs
CasperMD5CheckResult: fail
CasperVersion: 1.445.1
CurrentDesktop: ubuntu:GNOME
Date: Sun Jun  6 12:34:28 2021
HookError_source_ubiquity:
 Traceback (most recent call last):
   File "/usr/lib/python3/dist-packages/apport/report.py", line 225, in _run_hook
     exec(compile(fd.read(), hook, 'exec'), symb)
 OSError: [Errno 5] Input/output error
LiveMediaBuild: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
ProcEnviron:
 LANGUAGE=en_GB.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 LC_NUMERIC=C.UTF-8
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal
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errno5 installing with usb flash
https://bugs.launchpad.net/bugs/1931013
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