Public bug reported:

beuno@martin-XPS-13:~$ sudo do-release-upgrade -d
[sudo] password for beuno: 
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [1,554 B]                                          
                                                  
Get:2 Upgrade tool [1,344 kB]                                                   
                                                  
Fetched 1,346 kB in 0s (0 B/s)                                                  
                                                  
authenticate 'focal.tar.gz' against 'focal.tar.gz.gpg' 
extracting 'focal.tar.gz'

Reading cache

Checking package manager
Reading package lists... Done
Building dependency tree        
Reading state information... Done
Ign http://dl.google.com/linux/chrome/deb stable InRelease                      
                                                  
Hit https://repo.skype.com/deb stable InRelease                                 
                                                  
Hit http://dl.google.com/linux/chrome/deb stable Release                        
                                                  
Hit https://download.docker.com/linux/ubuntu bionic InRelease                   
                                                  
Hit http://archive.canonical.com/ubuntu bionic InRelease                        
                                                  
Get:1 http://packages.microsoft.com/repos/vscode stable InRelease [3,959 B]     
                                                  
Hit http://prerelease.keybase.io/deb stable InRelease                           
                                                  
Get:2 http://packages.microsoft.com/repos/vscode stable/main amd64 Packages 
[173 kB]                                              
Get:3 http://mirrors.ubuntu.com/mirrors.txt Mirrorlist [105 B]                  
                                                  
Get:4 http://ubuntu.unc.edu.ar/ubuntu bionic-updates InRelease [88.7 kB]        
                                                  
Hit http://mirrors.eze.sysarmy.com/ubuntu bionic InRelease                      
                                                  
Get:5 http://mirrors.eze.sysarmy.com/ubuntu bionic-backports InRelease [74.6 
kB]                                                  
Get:6 http://mirrors.eze.sysarmy.com/ubuntu bionic-security InRelease [88.7 kB] 
                                                  
Get:7 http://ubuntu.unc.edu.ar/ubuntu bionic-updates/main amd64 DEP-11 Metadata 
[307 kB]                                          
Get:8 http://mirrors.eze.sysarmy.com/ubuntu bionic-backports/universe amd64 
DEP-11 Metadata [7,972 B]                             
Get:9 http://ubuntu.unc.edu.ar/ubuntu bionic-updates/universe amd64 DEP-11 
Metadata [273 kB]                                      
Get:10 http://mirrors.eze.sysarmy.com/ubuntu bionic-security/main amd64 DEP-11 
Metadata [38.7 kB]                                 
Get:11 http://ubuntu.unc.edu.ar/ubuntu bionic-updates/multiverse amd64 DEP-11 
Metadata [2,468 B]                                  
Get:12 http://mirrors.eze.sysarmy.com/ubuntu bionic-security/universe amd64 
DEP-11 Metadata [42.1 kB]                             
Get:13 http://mirrors.eze.sysarmy.com/ubuntu bionic-security/multiverse amd64 
DEP-11 Metadata [2,464 B]                           
Fetched 1,103 kB in 0s (0 B/s)                                                  
                                                  
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

Checking for installed snaps

Calculating snap size requirements

Updating repository information

Third party sources disabled

Some third party entries in your sources.list were disabled. You can 
re-enable them after the upgrade with the 'software-properties' tool 
or your package manager. 

To continue please press [ENTER]

Get:1 http://archive.canonical.com/ubuntu focal InRelease [12.1 kB]             
                                                  
Get:2 http://archive.canonical.com/ubuntu focal/partner i386 Packages [1,620 B] 
                                                  
Get:3 http://archive.canonical.com/ubuntu focal/partner amd64 Packages [1,596 
B]                                                  
Get:4 http://archive.canonical.com/ubuntu focal/partner Translation-en [804 B]  
                                                  
Fetched 16.1 kB in 0s (0 B/s)                                                   
                                                  

Checking package manager
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

Invalid package information

After updating your package information, the essential package 
'ubuntu-minimal' could not be located. This may be because you have 
no official mirrors listed in your software sources, or because of 
excessive load on the mirror you are using. See /etc/apt/sources.list 
for the current list of configured software sources. 
In the case of an overloaded mirror, you may want to try the upgrade 
again later. 


Restoring original system state

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

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.37
ProcVersionSignature: Ubuntu 5.3.0-46.38~18.04.1-generic 5.3.18
Uname: Linux 5.3.0-46-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.14
Architecture: amd64
CrashDB: ubuntu
Date: Mon Apr 20 12:27:49 2020
InstallationDate: Installed on 2019-01-25 (450 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-04-20 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2020-04-20 12:27:20.010405
 Log time: 2020-04-20 12:27:27.807797
 Log time: 2020-04-20 12:27:48.851185
 Log time: 2020-04-20 12:27:51.115228

** 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/1873891

Title:
  After updating your package information, the essential package
  'ubuntu-minimal' could not be located

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