[Bug 1827123] [NEW] could not upgrade

[loop]

Public bug reported:

Building dependency tree        
Reading state information... Done
Hit http://us.archive.ubuntu.com/ubuntu bionic InRelease                      
Hit http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease              
Get:1 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]   
Get:2 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Fetched 163 kB in 0s (0 B/s)                                                  
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

Updating repository information
Hit http://us.archive.ubuntu.com/ubuntu cosmic InRelease                      
Hit http://us.archive.ubuntu.com/ubuntu cosmic-updates InRelease              
Hit http://security.ubuntu.com/ubuntu cosmic-security InRelease               
Hit http://us.archive.ubuntu.com/ubuntu cosmic-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.

If none of this applies, then please report this bug using the 
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.If 
you want to investigate this yourself the log files in 
'/var/log/dist-upgrade' will contain details about the upgrade. 
Specifically, look at 'main.log' and 'apt.log'. 


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 1:18.04.31
ProcVersionSignature: Ubuntu 4.18.0-18.19~18.04.1-generic 4.18.20
Uname: Linux 4.18.0-18-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Tue Apr 30 12:43:25 2019
InstallationDate: Installed on 2019-04-27 (3 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2019-04-30 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2019-04-30T12:29:38.181946

** 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/1827123

Title:
  could not upgrade

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

Bug description:
  Building dependency tree        
  Reading state information... Done
  Hit http://us.archive.ubuntu.com/ubuntu bionic InRelease                      
  Hit http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease              
  Get:1 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]   
  Get:2 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
  Fetched 163 kB in 0s (0 B/s)                                                  
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done

  Updating repository information
  Hit http://us.archive.ubuntu.com/ubuntu cosmic InRelease                      
  Hit http://us.archive.ubuntu.com/ubuntu cosmic-updates InRelease              
  Hit http://security.ubuntu.com/ubuntu cosmic-security InRelease               
  Hit http://us.archive.ubuntu.com/ubuntu cosmic-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.

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.If 
  you want to investigate this yourself the log files in 
  '/var/log/dist-upgrade' will contain details about the upgrade. 
  Specifically, look at 'main.log' and 'apt.log'. 

  
  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 1:18.04.31
  ProcVersionSignature: Ubuntu 4.18.0-18.19~18.04.1-generic 4.18.20
  Uname: Linux 4.18.0-18-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Apr 30 12:43:25 2019
  InstallationDate: Installed on 2019-04-27 (3 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2019-04-30 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2019-04-30T12:29:38.181946

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