[Bug 1901812] Re: Error in do-release-upgrade, invalid start byte

[Retromingent]

My issue was resolved by executing "pop-upgrade release upgrade" rather
than "do-release-upgrade".  Additionally, I had to uninstall the gnome-
initial-setup package and install pop-desktop.    This is not on a
System76 machine, but a custom server (Skylake generation).

User error?  Should "do-release-upgrade" have worked for PopOS?

My steps that resolved this:
1. sudo apt purge gnome-initial-setup
2. sudo apt install pop-desktop
3. pop-upgrade release upgrade

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https://bugs.launchpad.net/bugs/1901812

Title:
  Error in do-release-upgrade, invalid start byte

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

Bug description:
  do-release-upgrade 
  Checking for a new Ubuntu release
  Get:1 Upgrade tool signature [819 B]                                                                                                                              
  Get:2 Upgrade tool [1.338 kB]                                                                                                                                     
  Fetched 1.339 kB in 0s (0 B/s)                                                                                                                                    
  authenticate 'groovy.tar.gz' against 'groovy.tar.gz.gpg' 
  extracting 'groovy.tar.gz'

  Reading cache

  Checking package manager
  Reading package lists... Done
  Building dependency tree        
  Reading state information... Done
  Hit http://security.ubuntu.com/ubuntu focal-security InRelease                                                                                                    
  Hit http://de.archive.ubuntu.com/ubuntu focal InRelease                                                                                                           
  Hit http://de.archive.ubuntu.com/ubuntu focal-updates InRelease                                                                                                   
  Hit http://de.archive.ubuntu.com/ubuntu focal-security InRelease                                                                                                  
  Hit https://updates.signal.org/desktop/apt xenial InRelease                                                                                                       
  Hit http://de.archive.ubuntu.com/ubuntu focal-backports InRelease                                                                                                 
  Fetched 0 B in 0s (0 B/s)                                                                                                                                         
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done

  Checking for installed snaps

  Calculating snap size requirements

  Updating repository information

  Traceback (most recent call last):
    File "/tmp/ubuntu-release-upgrader-7jgue_gd/groovy", line 8, in <module>
      sys.exit(main())
    File "/tmp/ubuntu-release-upgrader-7jgue_gd/DistUpgrade/DistUpgradeMain.py", line 238, in main
      if app.run():
    File "/tmp/ubuntu-release-upgrader-7jgue_gd/DistUpgrade/DistUpgradeController.py", line 2089, in run
      return self.fullUpgrade()
    File "/tmp/ubuntu-release-upgrader-7jgue_gd/DistUpgrade/DistUpgradeController.py", line 1932, in fullUpgrade
      if not self.updateSourcesList():
    File "/tmp/ubuntu-release-upgrader-7jgue_gd/DistUpgrade/DistUpgradeController.py", line 801, in updateSourcesList
      self.sources = SourcesList(matcherPath=self.datadir)
    File "/usr/lib/python3/dist-packages/aptsources/sourceslist.py", line 273, in __init__
      self.matcher = SourceEntryMatcher(matcherPath)
    File "/usr/lib/python3/dist-packages/aptsources/sourceslist.py", line 470, in __init__
      dist = DistInfo(base_dir=matcherPath)
    File "/usr/lib/python3/dist-packages/aptsources/distinfo.py", line 184, in __init__
      with open(dist_fname) as dist_file:
  FileNotFoundError: [Errno 2] No such file or directory: '/tmp/ubuntu-release-upgrader-7jgue_gd/Ubuntu.info'
  Error in sys.excepthook:
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/problem_report.py", line 477, in add_to_existing
      self.write(f)
    File "/usr/lib/python3/dist-packages/problem_report.py", line 430, in write
      block = f.read(1048576)
    File "/usr/lib/python3.8/codecs.py", line 322, in decode
      (result, consumed) = self._buffer_decode(data, self.errors, final)
  UnicodeDecodeError: 'utf-8' codec can't decode byte 0x8b in position 1: invalid start byte

  Original exception was:
  Traceback (most recent call last):
    File "/tmp/ubuntu-release-upgrader-7jgue_gd/groovy", line 8, in <module>
      sys.exit(main())
    File "/tmp/ubuntu-release-upgrader-7jgue_gd/DistUpgrade/DistUpgradeMain.py", line 238, in main
      if app.run():
    File "/tmp/ubuntu-release-upgrader-7jgue_gd/DistUpgrade/DistUpgradeController.py", line 2089, in run
      return self.fullUpgrade()
    File "/tmp/ubuntu-release-upgrader-7jgue_gd/DistUpgrade/DistUpgradeController.py", line 1932, in fullUpgrade
      if not self.updateSourcesList():
    File "/tmp/ubuntu-release-upgrader-7jgue_gd/DistUpgrade/DistUpgradeController.py", line 801, in updateSourcesList
      self.sources = SourcesList(matcherPath=self.datadir)
    File "/usr/lib/python3/dist-packages/aptsources/sourceslist.py", line 273, in __init__
      self.matcher = SourceEntryMatcher(matcherPath)
    File "/usr/lib/python3/dist-packages/aptsources/sourceslist.py", line 470, in __init__
      dist = DistInfo(base_dir=matcherPath)
    File "/usr/lib/python3/dist-packages/aptsources/distinfo.py", line 184, in __init__
      with open(dist_fname) as dist_file:
  FileNotFoundError: [Errno 2] No such file or directory: '/tmp/ubuntu-release-upgrader-7jgue_gd/Ubuntu.info'

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.28
  ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
  Uname: Linux 5.4.0-52-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.10
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  Date: Wed Oct 28 08:08:54 2020
  InstallationDate: Installed on 2017-02-26 (1339 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to focal on 2020-10-28 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2020-10-28 08:02:19.591618
   Log time: 2020-10-28 08:02:21.893284
  mtime.conffile..etc.update-manager.release-upgrades: 2020-10-26T16:30:12.861944

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