Failed to upgrade to 21.04 (Check your Internet connection)

Hi,
I've been trying for over 20 times to upgrade from 20.10 to 21.04 and every time I get a "Check your Internet connection..." error message. It cannont come from my connection as I've already upgraded to 21.04 another laptop I've got.
It is rather frustrating.
Can you help out?
Thanks

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: linux-image-5.8.0-59-generic 5.8.0-59.66
ProcVersionSignature: Ubuntu 5.8.0-59.66-generic 5.8.18
Uname: Linux 5.8.0-59-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia wl
ApportVersion: 2.20.11-0ubuntu50.7
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: noroc 2017 F.... pulseaudio
 /dev/snd/controlC0: noroc 2017 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon Jun 28 16:43:43 2021
HibernationDevice: RESUME=UUID=08e735b3-3c99-4a20-87d7-373af6a33b5d
InstallationDate: Installed on 2017-01-25 (1614 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
MachineType: ASUSTeK COMPUTER INC. X555LN
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-59-generic root=UUID=8ea943c5-52e5-4ef6-9776-56411fcf20f0 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.8.0-59-generic N/A
 linux-backports-modules-5.8.0-59-generic N/A
 linux-firmware 1.190.5
SourcePackage: linux
UpgradeStatus: Upgraded to groovy on 2021-06-28 (0 days ago)
dmi.bios.date: 08/14/2014
dmi.bios.release: 4.6
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: X555LN.309
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: X555LN
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX555LN.309:bd08/14/2014:br4.6:svnASUSTeKCOMPUTERINC.:pnX555LN:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX555LN:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.family: X
dmi.product.name: X555LN
dmi.product.sku: ASUS-NotebookSKU
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.