[Bug 1923068] [NEW] nvidia-340 package post-installation script subprocess returned error exit status 10

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I love Ubuntu!!
I had the following error code while upgrading from ubuntu 18.04 to 20.04 :
'''sh
installed nvidia-340 package post-installation script subprocess returned error exit status 10
'''
This followed by the upgrade getting aborted. From now onwards the screen is blank whenever it is restarted.
Then I had to follow this article

https://koen.vervloesem.eu/blog/fixing-a-failed-upgrade-to-ubuntu-2004
-lts-in-recovery-mode/

and this article helped me to get back the desktop GUI view. 
However I would like to know why it was caused. Was it due to hardware problems or the incomplete installation of any drivers, I am not sure of it. I am reporting this as a bug because I was told to do so by the do-release-upgrade software. Please let me know if you need any logs.

--
regards,
Srikar Siddarth

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.30
ProcVersionSignature: Ubuntu 5.4.0-70.78-generic 5.4.94
Uname: Linux 5.4.0-70-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Thu Apr  8 21:20:24 2021
InstallationDate: Installed on 2017-06-13 (1395 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: Upgraded to focal on 2021-04-08 (0 days ago)
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade focal
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nvidia-340 package post-installation script subprocess returned error exit status 10  
https://bugs.launchpad.net/bugs/1923068
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