[Bug 1886748] Re: upgrade from 18.04 to 20.04 fails to calculate if libomp5 is installed

[Brian Murray]

I tested a second upgrade from bionic to focal with my PPA enabled and
this time libomp5 was identified as an "Unused dependencies" and a
"remove_candidates". However, this time it was actually marked for
removal while previously this appeared in /var/log/dist-
upgrade/main.log:

 2020-08-22 09:49:11,854 DEBUG package 'libomp5' produces an unwanted removal 'gnome-software-plugin-snap', skipping
 2020-08-22 09:49:12,751 DEBUG 'libomp5' scheduled for remove but not safe to remove, skipping

So I think the debian/control changes in the PPA work but something else
is wrong with the release-upgrader and the snap removal work.

** Attachment added: "apport.ubuntu-release-upgrader-core.4spyeerc.apport"
   https://bugs.launchpad.net/ubuntu/+source/llvm-toolchain-10/+bug/1886748/+attachment/5408800/+files/apport.ubuntu-release-upgrader-core.4spyeerc.apport

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https://bugs.launchpad.net/bugs/1886748

Title:
  upgrade from 18.04 to 20.04 fails to calculate if libomp5 is installed

Status in llvm-toolchain-10 package in Ubuntu:
  New
Status in llvm-toolchain-9 package in Ubuntu:
  New
Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed
Status in llvm-toolchain-10 source package in Focal:
  New
Status in llvm-toolchain-9 source package in Focal:
  New
Status in ubuntu-release-upgrader source package in Focal:
  Confirmed

Bug description:
  ~$ sudo do-release-upgrade -d
  Checking for a new Ubuntu release
  Get:1 Upgrade tool signature [1,554 B]                                                                                              
  Get:2 Upgrade tool [1,342 kB]                                                                                                       
  Fetched 1,343 kB in 0s (0 B/s)                                                                                                      
  authenticate 'focal.tar.gz' against 'focal.tar.gz.gpg' 
  extracting 'focal.tar.gz'

  Reading cache

  Checking package manager
  Reading package lists... Done
  Building dependency tree        
  Reading state information... Done
  Hit http://archive.ubuntu.com/ubuntu bionic InRelease                                                                               
  Hit http://archive.ubuntu.com/ubuntu bionic-updates InRelease                                                                       
  Hit http://archive.ubuntu.com/ubuntu bionic-backports InRelease                                                                     
  Hit http://archive.ubuntu.com/ubuntu bionic-security InRelease                                                                      
  Fetched 0 B in 0s (0 B/s)                                                                                                           
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done

  Updating repository information
  Hit http://archive.ubuntu.com/ubuntu focal InRelease                                                                                
  Hit http://archive.ubuntu.com/ubuntu focal-updates InRelease                                                                        
  Hit http://archive.ubuntu.com/ubuntu focal-backports InRelease                                                                      
  Hit http://archive.ubuntu.com/ubuntu focal-security 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 was caused by: 
  * Upgrading to a pre-release version of Ubuntu 
  This is most likely a transient problem, 
  please try again later. 
  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 1:18.04.37
  ProcVersionSignature: Ubuntu 4.15.0-109.110-generic 4.15.18
  Uname: Linux 4.15.0-109-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.15
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Wed Jul  8 13:26:03 2020
  InstallationDate: Installed on 2018-02-19 (869 days ago)
  InstallationMedia: Xubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-07-08 (0 days ago)

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