[Bug 1787712] Re: 16.04 to 18.04 do-release-upgrade fails with "Command terminated with exit status 1"

[BatulR]

I am trying to upgrade from 16.04 to 18.04

apt-get update and apt-get upgrade command executed successfully after
installing necessary packages suggested as resolutions to these commands

however sudo do-release-upgrade fails with following details

Checking for a new Ubuntu release
Get:1 Upgrade tool signature [819 B]                                           
Get:2 Upgrade tool [1,240 kB]                                                  
Fetched 1,241 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://in.archive.ubuntu.com/ubuntu xenial InRelease                       
Fetched 0 B in 0s (0 B/s)                                                      
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

Restoring original system state

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


The log doesnt indicate what is missing.
How to Proceed?

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https://bugs.launchpad.net/bugs/1787712

Title:
  16.04 to 18.04 do-release-upgrade fails with "Command terminated with
  exit status 1"

Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed

Bug description:
  Upgrade fails with:

  Reading cache

  Checking package manager
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  Hit http://ucho.ignum.cz/ubuntu xenial InRelease
  Hit http://archive.canonical.com/ubuntu xenial InRelease
  Fetched 0 B in 0s (0 B/s)
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done

  Restoring original system state

  Aborting
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  === Command terminated with exit status 1 (Sat Aug 18 11:47:54 2018) ===

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