Public bug reported:

I checked for broken packages and updated everything through apt.

When running sudo do-release-upgrade, it hangs after the second "Reading
state information... done" after fetching packages, and then gives me

Aborting
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

Here is the main.log output:
2021-03-08 16:03:28,238 INFO Using config files '['./DistUpgrade.cfg.bionic']'
2021-03-08 16:03:28,238 INFO uname information: 'Linux sahil-Precision-Tower-79$
2021-03-08 16:03:28,741 INFO apt version: '1.6.12ubuntu0.2'
2021-03-08 16:03:28,741 INFO python version: '3.6.9 (default, Jan 26 2021, 15:3$
[GCC 8.4.0]'
2021-03-08 16:03:28,746 INFO release-upgrader version '20.04.29' started
2021-03-08 16:03:28,757 INFO locale: 'en_US' 'UTF-8'
2021-03-08 16:03:28,824 INFO screen could not be run
2021-03-08 16:03:28,864 DEBUG Using 'DistUpgradeViewText' view
2021-03-08 16:03:28,924 DEBUG enable dpkg --force-overwrite
2021-03-08 16:03:28,973 DEBUG creating statefile: '/var/log/dist-upgrade/apt-cl$
2021-03-08 16:03:32,763 DEBUG lsb-release: 'bionic'
2021-03-08 16:03:32,764 DEBUG _pythonSymlinkCheck run
2021-03-08 16:03:32,766 DEBUG openCache()
2021-03-08 16:03:32,766 DEBUG quirks: running PreCacheOpen
2021-03-08 16:03:32,767 DEBUG running Quirks.PreCacheOpen
2021-03-08 16:03:33,933 DEBUG Comparing 4.15.0-136 with
2021-03-08 16:03:33,934 DEBUG Comparing 4.15.0-50 with 4.15.0-136
2021-03-08 16:03:33,934 DEBUG Comparing 4.15.0-51 with 4.15.0-136
2021-03-08 16:03:33,934 DEBUG Comparing 4.15.0-52 with 4.15.0-1362021-03-08 
16:03:34,187 DEBUG /openCache(), new cache size 102155
2021-03-08 16:03:34,187 DEBUG need_server_mode(): run in 'desktop' mode, (becau$
2021-03-08 16:03:34,187 DEBUG checkViewDepends()
2021-03-08 16:03:34,188 DEBUG running doUpdate() (showErrors=False)
2021-03-08 16:03:36,933 DEBUG openCache()
2021-03-08 16:03:38,236 DEBUG Comparing 4.15.0-136 with
2021-03-08 16:03:38,237 DEBUG Comparing 4.15.0-50 with 4.15.0-136
2021-03-08 16:03:38,237 DEBUG Comparing 4.15.0-51 with 4.15.0-136
2021-03-08 16:03:38,237 DEBUG Comparing 4.15.0-52 with 4.15.0-136
2021-03-08 16:03:38,551 DEBUG /openCache(), new cache size 102155
2021-03-08 16:03:38,552 DEBUG doPostInitialUpdate
2021-03-08 16:03:38,552 DEBUG quirks: running focalPostInitialUpdate
2021-03-08 16:03:38,552 DEBUG running Quirks.focalPostInitialUpdate
2021-03-08 16:05:39,529 DEBUG abort called
2021-03-08 16:05:39,530 DEBUG openCache()
2021-03-08 16:05:40,757 DEBUG Comparing 4.15.0-136 with
2021-03-08 16:05:40,758 DEBUG Comparing 4.15.0-50 with 4.15.0-136
2021-03-08 16:05:40,758 DEBUG Comparing 4.15.0-51 with 4.15.0-136
2021-03-08 16:05:40,758 DEBUG Comparing 4.15.0-52 with 4.15.0-136
2021-03-08 16:05:41,022 DEBUG /openCache(), new cache size 102155

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.42
ProcVersionSignature: Ubuntu 4.15.0-136.140-generic 4.15.18
Uname: Linux 4.15.0-136-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.23
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Mon Mar  8 15:50:00 2021
InstallationDate: Installed on 2018-11-07 (852 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2021-03-08 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2021-03-08 15:10:03.838970
 Log time: 2021-03-08 15:10:07.843096
 Log time: 2021-03-08 15:12:10.311055

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


** Tags: amd64 apport-bug bionic dist-upgrade

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https://bugs.launchpad.net/bugs/1918208

Title:
  failed upgrade from 18.04 to 20.04

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