[Bug 1868248] Re: Upgrade from Ubuntu 14.04 LTS to Ubuntu 16.04 LTS is giving errors

[Tanay Suthar]

** Summary changed:

- Upgrade from Ubuntu 14.04 LTS to Ubuntu 16.04 LTS is giving erros
+ Upgrade from Ubuntu 14.04 LTS to Ubuntu 16.04 LTS is giving errors

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https://bugs.launchpad.net/bugs/1868248

Title:
  Upgrade from Ubuntu 14.04 LTS to Ubuntu 16.04 LTS is giving errors

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

Bug description:
  I'm in process of upgrading Ubuntu 14.04 LTS to Ubuntu 16.04 LTS.
  However, "do-release-upgrade" command gave me following errors

  .....
  .....
  .....
  Hit http://security.ubuntu.com xenial-security/restricted Translation-en                                                                                      
  Hit http://security.ubuntu.com xenial-security/universe Translation-en                                                                                        
  Fetched 0 B in 0s (0 B/s)                                                                                                                                     

  Checking package manager
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done
  Building data structures... 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
  Building data structures... Done 
  === Command terminated with exit status 1 (Fri Mar 20 11:12:48 2020) ===
  .....
  .....
  .....

  What could be the possible issue ??

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.11
  ProcVersionSignature: Ubuntu 3.13.0-170.220-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-170-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.29
  Architecture: amd64
  CrashDB: ubuntu
  Date: Fri Mar 20 11:08:45 2020
  Ec2AMI: ami-08dca46dd505f5327
  Ec2AMIManifest: (unknown)
  Ec2AvailabilityZone: us-east-1a
  Ec2InstanceType: t2.2xlarge
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  PackageArchitecture: all
  ProcEnviron:
   LC_CTYPE=en_US.UTF-8
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2020-03-20 (0 days ago)

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