Comment 8 for bug 1787712

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?