can't upgrade to 20 from 18

[Ass Afep]

upgrade to focal fossa failed in step: Setting new software channels.

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'.

main.log:

2020-11-08 12:52:07,957 INFO Using config files '['./DistUpgrade.cfg.bionic']'
2020-11-08 12:52:07,957 INFO uname information: 'Linux z-XPS-15-9560 4.15.0-122-generic #124-Ubuntu SMP Thu Oct 15 13:03:05 UTC 2020 x86_64'
2020-11-08 12:52:08,293 INFO apt version: '1.6.12ubuntu0.1'
2020-11-08 12:52:08,293 INFO python version: '3.6.9 (default, Oct 8 2020, 12:12:24)
[GCC 8.4.0]'
2020-11-08 12:52:08,296 INFO release-upgrader version '20.04.28' started
2020-11-08 12:52:08,343 INFO locale: 'en_IL' 'UTF-8'
2020-11-08 12:52:08,491 DEBUG Using 'DistUpgradeViewGtk3' view
2020-11-08 12:52:08,529 DEBUG enable dpkg --force-overwrite
2020-11-08 12:52:08,543 DEBUG creating statefile: '/var/log/dist-upgrade/apt-clone_system_state.tar.gz'
2020-11-08 12:52:11,259 DEBUG lsb-release: 'bionic'
2020-11-08 12:52:11,260 DEBUG _pythonSymlinkCheck run
2020-11-08 12:52:11,260 DEBUG openCache()
2020-11-08 12:52:11,260 DEBUG quirks: running PreCacheOpen
2020-11-08 12:52:11,260 DEBUG running Quirks.PreCacheOpen
2020-11-08 12:52:12,178 DEBUG Comparing 4.15.0-118 with
2020-11-08 12:52:12,178 DEBUG Comparing 4.15.0-121 with 4.15.0-118
2020-11-08 12:52:12,178 DEBUG Comparing 4.15.0-122 with 4.15.0-121
2020-11-08 12:52:12,375 DEBUG /openCache(), new cache size 100207
2020-11-08 12:52:12,375 DEBUG need_server_mode(): run in 'desktop' mode, (because of pkg 'ubuntu-desktop')
2020-11-08 12:52:12,375 DEBUG checkViewDepends()
2020-11-08 12:52:12,376 DEBUG running doUpdate() (showErrors=False)
2020-11-08 12:52:14,858 DEBUG openCache()
2020-11-08 12:52:15,770 DEBUG Comparing 4.15.0-118 with
2020-11-08 12:52:15,770 DEBUG Comparing 4.15.0-121 with 4.15.0-118
2020-11-08 12:52:15,770 DEBUG Comparing 4.15.0-122 with 4.15.0-121
2020-11-08 12:52:16,005 DEBUG /openCache(), new cache size 100207
2020-11-08 12:52:16,005 DEBUG doPostInitialUpdate
2020-11-08 12:52:16,005 DEBUG quirks: running focalPostInitialUpdate
2020-11-08 12:52:16,006 DEBUG running Quirks.focalPostInitialUpdate
2020-11-08 12:52:18,373 DEBUG Snap core18 is installed
2020-11-08 12:52:18,554 DEBUG Snap gnome-3-34-1804 is installed
2020-11-08 12:52:18,554 DEBUG Snap gnome-3-34-1804 is not tracking the release channel
2020-11-08 12:52:18,758 DEBUG Snap gtk-common-themes is installed
2020-11-08 12:52:19,382 DEBUG Snap gnome-3-28-1804 is installed
2020-11-08 12:52:19,382 DEBUG Snap gnome-3-28-1804 is not tracking the release channel
2020-11-08 12:52:19,820 DEBUG Snap gnome-calculator is installed
2020-11-08 12:52:20,026 DEBUG Snap gnome-characters is installed
2020-11-08 12:52:20,257 DEBUG Snap gnome-logs is installed
2020-11-08 12:52:22,465 DEBUG MetaPkgs: ubuntu-desktop
2020-11-08 12:52:24,676 DEBUG Foreign:
2020-11-08 12:52:24,676 DEBUG Obsolete: azure-cli code containerd.io dive docker-ce docker-ce-cli google-chrome-stable google-cloud-sdk java-1.8.0-amazon-corretto-jdk libwireshark12 libwireshark13 libwiretap10 libwiretap9 libwsutil10 libwsutil11 mongodb-org-shell oracle-java8-installer oracle-java8-set-default sbt session-manager-plugin skypeforlinux zoom
2020-11-08 12:52:24,677 DEBUG updateSourcesList()
2020-11-08 12:52:24,684 DEBUG rewriteSourcesList() with mirror_check
2020-11-08 12:52:24,684 DEBUG ['ubuntu-minimal', 'ubuntu-standard']
2020-11-08 12:52:24,684 DEBUG Checking pkg: ubuntu-minimal
2020-11-08 12:52:24,685 DEBUG Checking pkg: ubuntu-standard
2020-11-08 12:52:24,686 DEBUG examining: 'deb http://il.archive.ubuntu.com/ubuntu/ bionic main restricted multiverse'
2020-11-08 12:52:24,686 DEBUG verifySourcesListEntry: deb http://il.archive.ubuntu.com/ubuntu/ focal main restricted multiverse
2020-11-08 12:52:24,686 DEBUG url_downloadable: http://il.archive.ubuntu.com/ubuntu//dists/focal/Release
2020-11-08 12:52:24,686 DEBUG s='http' n='il.archive.ubuntu.com' p='/ubuntu//dists/focal/Release' q='' f=''
2020-11-08 12:52:24,746 DEBUG entry 'deb http://il.archive.ubuntu.com/ubuntu/ focal main restricted multiverse' updated to new dist
2020-11-08 12:52:24,746 DEBUG examining: 'deb http://il.archive.ubuntu.com/ubuntu/ bionic-updates main restricted multiverse'
2020-11-08 12:52:24,746 DEBUG entry 'deb http://il.archive.ubuntu.com/ubuntu/ focal-updates main restricted multiverse' updated to new dist
2020-11-08 12:52:24,746 DEBUG examining: 'deb http://il.archive.ubuntu.com/ubuntu/ bionic universe'
2020-11-08 12:52:24,746 DEBUG entry 'deb http://il.archive.ubuntu.com/ubuntu/ focal universe' updated to new dist
2020-11-08 12:52:24,746 DEBUG examining: 'deb http://il.archive.ubuntu.com/ubuntu/ bionic-updates universe'
2020-11-08 12:52:24,746 DEBUG entry 'deb http://il.archive.ubuntu.com/ubuntu/ focal-updates universe' updated to new dist
2020-11-08 12:52:24,747 DEBUG examining: 'deb http://security.ubuntu.com/ubuntu bionic-security main restricted multiverse'
2020-11-08 12:52:24,747 DEBUG verifySourcesListEntry: deb http://security.ubuntu.com/ubuntu focal main restricted multiverse
2020-11-08 12:52:24,747 DEBUG url_downloadable: http://security.ubuntu.com/ubuntu/dists/focal/Release
2020-11-08 12:52:24,747 DEBUG s='http' n='security.ubuntu.com' p='/ubuntu/dists/focal/Release' q='' f=''
2020-11-08 12:52:25,051 DEBUG entry 'deb http://security.ubuntu.com/ubuntu focal-security main restricted multiverse' updated to new dist
2020-11-08 12:52:25,051 DEBUG examining: 'deb http://security.ubuntu.com/ubuntu bionic-security universe'
2020-11-08 12:52:25,051 DEBUG entry 'deb http://security.ubuntu.com/ubuntu focal-security universe' updated to new dist
2020-11-08 12:52:25,054 DEBUG running doUpdate() (showErrors=True)
2020-11-08 12:52:49,520 DEBUG openCache()
2020-11-08 12:52:50,146 DEBUG Comparing 4.15.0-118 with
2020-11-08 12:52:50,147 DEBUG Comparing 4.15.0-121 with 4.15.0-118
2020-11-08 12:52:50,147 DEBUG Comparing 4.15.0-122 with 4.15.0-121
2020-11-08 12:52:50,288 DEBUG /openCache(), new cache size 66753
2020-11-08 12:52:50,288 DEBUG need_server_mode(): run in 'desktop' mode, (because of pkg 'ubuntu-desktop')
2020-11-08 12:52:50,289 DEBUG quirks: running PreDistUpgradeCache
2020-11-08 12:52:50,289 DEBUG running Quirks.PreDistUpgradeCache
2020-11-08 12:52:50,289 INFO checking for python-dbg
2020-11-08 12:52:50,289 INFO checking for python-doc
2020-11-08 12:52:50,289 INFO checking for python-minimal
2020-11-08 12:52:50,289 INFO installing python-is-python2 because python-minimal was installed
2020-11-08 12:52:50,289 DEBUG Installing 'python-is-python2' (python-minimal was installed on the system)

apt.log:
Log time: 2020-11-08 12:52:12.371746
Log time: 2020-11-08 12:52:15.993383
Log time: 2020-11-08 12:52:50.275689
  MarkInstall python-is-python2:amd64 < none -> 2.7.17-4 @un uN Ib > FU=1
  Installing python2 as Depends of python-is-python2
    MarkInstall python2:amd64 < none -> 2.7.17-2ubuntu4 @un uN Ib > FU=0
    Installing python2-minimal as PreDepends of python2
      MarkInstall python2-minimal:amd64 < none -> 2.7.17-2ubuntu4 @un uN Ib > FU=0
       Removing: python-minimal
        MarkDelete python-minimal:amd64 < 2.7.15~rc1-1 @ii mK > FU=0
    Installing libpython2-stdlib as Depends of python2
      MarkInstall libpython2-stdlib:amd64 < none -> 2.7.17-2ubuntu4 @un uN Ib > FU=0
       Removing: libpython-stdlib
        MarkDelete libpython-stdlib:amd64 < 2.7.15~rc1-1 @ii mK > FU=0
     Removing: python
      MarkDelete python:amd64 < 2.7.15~rc1-1 @ii mK Ib > FU=0
Starting pkgProblemResolver with broken count: 3
Starting 2 pkgProblemResolver with broken count: 3
Investigating (0) nodejs:amd64 < 10.22.1-1nodesource1 @ii mK Ib >
Broken nodejs:amd64 Depends on python-minimal:amd64 < 2.7.15~rc1-1 @ii gR >
  Considering python-minimal:amd64 1 as a solution to nodejs:amd64 79
  Added python-minimal:amd64 to the remove list
  Fixing nodejs:amd64 via keep of python-minimal:amd64
  MarkKeep python-minimal:amd64 < 2.7.15~rc1-1 @ii gR > FU=0
Investigating (0) python2-minimal:amd64 < none -> 2.7.17-2ubuntu4 @un umN Ib >
Broken python2-minimal:amd64 Breaks on python-minimal:amd64 < 2.7.15~rc1-1 @ii gK > (< 2.7.15-2)
  Considering python-minimal:amd64 1 as a solution to python2-minimal:amd64 3
  Added python-minimal:amd64 to the remove list
  Fixing python2-minimal:amd64 via remove of python-minimal:amd64
  MarkDelete python-minimal:amd64 < 2.7.15~rc1-1 @ii gK > FU=0
Investigating (0) python-all-dev:amd64 < 2.7.15~rc1-1 -> 2.7.17-2ubuntu4 @ii umU Ib >
Broken python-all-dev:amd64 Depends on libpython-all-dev:amd64 < 2.7.15~rc1-1 | 2.7.17-2ubuntu4 @ii umH > (= 2.7.17-2ubuntu4)
  Considering libpython-all-dev:amd64 0 as a solution to python-all-dev:amd64 1
  MarkKeep python-all-dev:amd64 < 2.7.15~rc1-1 -> 2.7.17-2ubuntu4 @ii umU Ib > FU=0
  Re-Instated libpython2-dev:amd64
  Re-Instated libpython-all-dev:amd64
  Re-Instated python2-dev:amd64
  Re-Instated python-all-dev:amd64
Investigating (0) python2-dev:amd64 < none -> 2.7.17-2ubuntu4 @un uN Ib >
Broken python2-dev:amd64 Breaks on python-dev:amd64 < 2.7.15~rc1-1 @ii mK Ib > (< 2.7.15-2)
  Considering python-dev:amd64 -2 as a solution to python2-dev:amd64 0
  Added python-dev:amd64 to the remove list
  Fixing python2-dev:amd64 via remove of python-dev:amd64
  MarkDelete python-dev:amd64 < 2.7.15~rc1-1 @ii mK Ib > FU=0
Investigating (0) libpython2-dev:amd64 < none -> 2.7.17-2ubuntu4 @un uN Ib >
Broken libpython2-dev:amd64 Breaks on libpython-dev:amd64 < 2.7.15~rc1-1 @ii mK > (< 2.7.15-2)
  Considering libpython-dev:amd64 0 as a solution to libpython2-dev:amd64 0
  MarkKeep libpython2-dev:amd64 < none -> 2.7.17-2ubuntu4 @un uN Ib > FU=0
  Holding Back libpython2-dev:amd64 rather than change libpython-dev:amd64
Investigating (1) nodejs:amd64 < 10.22.1-1nodesource1 @ii mK Ib >
Broken nodejs:amd64 Depends on python-minimal:amd64 < 2.7.15~rc1-1 @ii gR >
  Considering python-minimal:amd64 1 as a solution to nodejs:amd64 79
  Added python-minimal:amd64 to the remove list
  Fixing nodejs:amd64 via keep of python-minimal:amd64
  MarkKeep python-minimal:amd64 < 2.7.15~rc1-1 @ii gR > FU=0
Investigating (1) python2-minimal:amd64 < none -> 2.7.17-2ubuntu4 @un umN Ib >
Broken python2-minimal:amd64 Breaks on python-minimal:amd64 < 2.7.15~rc1-1 @ii gK > (< 2.7.15-2)
  Considering python-minimal:amd64 1 as a solution to python2-minimal:amd64 3
  Added python-minimal:amd64 to the remove list
  Fixing python2-minimal:amd64 via remove of python-minimal:amd64
  MarkDelete python-minimal:amd64 < 2.7.15~rc1-1 @ii gK > FU=0
Investigating (1) python2-dev:amd64 < none -> 2.7.17-2ubuntu4 @un uN Ib >
Broken python2-dev:amd64 Depends on libpython2-dev:amd64 < none | 2.7.17-2ubuntu4 @un uH > (= 2.7.17-2ubuntu4)
  Considering libpython2-dev:amd64 0 as a solution to python2-dev:amd64 0
  MarkKeep python2-dev:amd64 < none -> 2.7.17-2ubuntu4 @un uN Ib > FU=0
  Holding Back python2-dev:amd64 rather than change libpython2-dev:amd64
Investigating (1) libpython-all-dev:amd64 < 2.7.15~rc1-1 -> 2.7.17-2ubuntu4 @ii umU Ib >
Broken libpython-all-dev:amd64 Depends on libpython2-dev:amd64 < none | 2.7.17-2ubuntu4 @un uH > (= 2.7.17-2ubuntu4)
  Considering libpython2-dev:amd64 0 as a solution to libpython-all-dev:amd64 0
  MarkKeep libpython-all-dev:amd64 < 2.7.15~rc1-1 -> 2.7.17-2ubuntu4 @ii umU Ib > FU=0
  Holding Back libpython-all-dev:amd64 rather than change libpython2-dev:amd64
Investigating (2) nodejs:amd64 < 10.22.1-1nodesource1 @ii mK Ib >
Broken nodejs:amd64 Depends on python-minimal:amd64 < 2.7.15~rc1-1 @ii gR >
  Considering python-minimal:amd64 1 as a solution to nodejs:amd64 79
  Added python-minimal:amd64 to the remove list
  Fixing nodejs:amd64 via keep of python-minimal:amd64
  MarkKeep python-minimal:amd64 < 2.7.15~rc1-1 @ii gR > FU=0
Investigating (2) python2-minimal:amd64 < none -> 2.7.17-2ubuntu4 @un umN Ib >
Broken python2-minimal:amd64 Breaks on python-minimal:amd64 < 2.7.15~rc1-1 @ii gK > (< 2.7.15-2)
  Considering python-minimal:amd64 79 as a solution to python2-minimal:amd64 3
  MarkKeep python2-minimal:amd64 < none -> 2.7.17-2ubuntu4 @un umN Ib > FU=0
  Holding Back python2-minimal:amd64 rather than change python-minimal:amd64
Investigating (2) python-all-dev:amd64 < 2.7.15~rc1-1 -> 2.7.17-2ubuntu4 @ii umU Ib >
Broken python-all-dev:amd64 Depends on libpython-all-dev:amd64 < 2.7.15~rc1-1 | 2.7.17-2ubuntu4 @ii umH > (= 2.7.17-2ubuntu4)
  Considering libpython-all-dev:amd64 0 as a solution to python-all-dev:amd64 1
  MarkKeep python-all-dev:amd64 < 2.7.15~rc1-1 -> 2.7.17-2ubuntu4 @ii umU Ib > FU=0
  Removing python-all-dev:amd64 rather than change libpython-all-dev:amd64
  MarkDelete python-all-dev:amd64 < 2.7.15~rc1-1 | 2.7.17-2ubuntu4 @ii umH Ib > FU=0
Investigating (3) python2:amd64 < none -> 2.7.17-2ubuntu4 @un umN Ib >
Broken python2:amd64 PreDepends on python2-minimal:amd64 < none | 2.7.17-2ubuntu4 @un umH > (= 2.7.17-2ubuntu4)
  Considering python2-minimal:amd64 3 as a solution to python2:amd64 5
  MarkKeep python2:amd64 < none -> 2.7.17-2ubuntu4 @un umN Ib > FU=0
  Holding Back python2:amd64 rather than change python2-minimal:amd64
Investigating (3) python-all:amd64 < 2.7.15~rc1-1 -> 2.7.17-2ubuntu4 @ii umU Ib >
Broken python-all:amd64 Depends on python2:amd64 < none | 2.7.17-2ubuntu4 @un umH > (= 2.7.17-2ubuntu4)
  Considering python2:amd64 5 as a solution to python-all:amd64 2
  MarkKeep python-all:amd64 < 2.7.15~rc1-1 -> 2.7.17-2ubuntu4 @ii umU Ib > FU=0
  Re-Instated python2-minimal:amd64
  Re-Instated python2:amd64
  Re-Instated python-all:amd64
Investigating (4) python2-minimal:amd64 < none -> 2.7.17-2ubuntu4 @un umN Ib >
Broken python2-minimal:amd64 Breaks on python-minimal:amd64 < 2.7.15~rc1-1 @ii gK > (< 2.7.15-2)
  Considering python-minimal:amd64 79 as a solution to python2-minimal:amd64 3
  MarkKeep python2-minimal:amd64 < none -> 2.7.17-2ubuntu4 @un umN Ib > FU=0
  Holding Back python2-minimal:amd64 rather than change python-minimal:amd64
Investigating (5) python2:amd64 < none -> 2.7.17-2ubuntu4 @un umN Ib >
Broken python2:amd64 PreDepends on python2-minimal:amd64 < none | 2.7.17-2ubuntu4 @un umH > (= 2.7.17-2ubuntu4)
  Considering python2-minimal:amd64 3 as a solution to python2:amd64 5
  MarkKeep python2:amd64 < none -> 2.7.17-2ubuntu4 @un umN Ib > FU=0
  Holding Back python2:amd64 rather than change python2-minimal:amd64
Investigating (5) python-all:amd64 < 2.7.15~rc1-1 -> 2.7.17-2ubuntu4 @ii umU Ib >
Broken python-all:amd64 Depends on python2:amd64 < none | 2.7.17-2ubuntu4 @un umH > (= 2.7.17-2ubuntu4)
  Considering python2:amd64 5 as a solution to python-all:amd64 2
  MarkKeep python-all:amd64 < 2.7.15~rc1-1 -> 2.7.17-2ubuntu4 @ii umU Ib > FU=0
  Removing python-all:amd64 rather than change python2:amd64
  MarkDelete python-all:amd64 < 2.7.15~rc1-1 | 2.7.17-2ubuntu4 @ii umH Ib > FU=0
Investigating (6) python-is-python2:amd64 < none -> 2.7.17-4 @un pumN Ib >
Broken python-is-python2:amd64 Depends on python2:amd64 < none | 2.7.17-2ubuntu4 @un umH >
  Considering python2:amd64 5 as a solution to python-is-python2:amd64 9999
Done

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.40
ProcVersionSignature: Ubuntu 4.15.0-122.124-generic 4.15.18
Uname: Linux 4.15.0-122-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sun Nov 8 12:48:46 2020
InstallationDate: Installed on 2018-11-09 (729 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-11-08 (0 days ago)
VarLogDistupgradeTermlog:

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Brian Murray (brian-murray)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1889250, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.