Public bug reported:

Version Using: Ubuntu 16.04.5 LTS

I am trying to update my ubuntu 16.04 to 18.04 but unable to do so.
Tried a lot of things but failed miserably. Here is my log when I try to
update via terminal

Checking for a new Ubuntu release
Get:1 Upgrade tool signature [819 B]                                           
Get:2 Upgrade tool [1.258 kB]                                                  
Fetched 1.259 kB in 0s (0 B/s)                                                 
authenticate 'bionic.tar.gz' against 'bionic.tar.gz.gpg' 
extracting 'bionic.tar.gz'

Reading cache

Checking package manager
Reading package lists... Done
Building dependency tree        
Reading state information... Done
Hit http://repo.steampowered.com/steam precise InRelease                       
Hit http://ppa.launchpad.net/git-core/ppa/ubuntu xenial InRelease              
Hit http://linux.teamviewer.com/deb stable InRelease                           
Hit http://linux.teamviewer.com/deb preview InRelease                          
Ign http://dl.google.com/linux/chrome/deb stable InRelease                     
Hit http://ppa.launchpad.net/jonathonf/vim/ubuntu xenial InRelease             
Hit http://dl.google.com/linux/chrome/deb stable Release                       
Hit http://us.archive.ubuntu.com/ubuntu xenial InRelease                       
Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [107 kB]     
Hit http://ppa.launchpad.net/ondrej/php/ubuntu xenial InRelease                
Hit https://repo.skype.com/deb stable InRelease                                
Hit https://download.docker.com/linux/ubuntu xenial InRelease                  
Hit http://ppa.launchpad.net/webupd8team/java/ubuntu xenial InRelease          
Get:2 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [109 kB]    
Hit https://download.sublimetext.com apt/stable/ InRelease                     
Get:3 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [107 kB]  
Hit https://packagecloud.io/slacktechnologies/slack/debian jessie InRelease    
Fetched 323 kB in 0s (0 B/s)                                                   
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

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]

Hit http://us.archive.ubuntu.com/ubuntu bionic InRelease                       
Hit http://security.ubuntu.com/ubuntu bionic-security InRelease                
Hit http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease               
Hit http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease             
Fetched 0 B in 0s (0 B/s)                                                      

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

Calculating the changes

Calculating the changes

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

This can be caused by: 
* Upgrading to a pre-release version of Ubuntu 
* Running the current pre-release version of Ubuntu 
* Unofficial software packages not provided by Ubuntu 

If none of this applies, then please report this bug using the 
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. 


Restoring original system state

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

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.15.0-36.39~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-36-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
Date: Mon Oct  8 17:11:35 2018
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-08-31 (403 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-10-08 (0 days ago)

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


** Tags: amd64 apport-bug dist-upgrade third-party-packages xenial

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https://bugs.launchpad.net/bugs/1796697

Title:
  Could not calculate upgrade ubuntu 16.04 to 18.04

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