I tried to upgrade from 18.04 to 20.04, but get an error: Could not calculate the upgrade. All 3rd party packages are disabled

[Taron Saribekyan]

Bellow whole log of process

sudo do-release-upgrade
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [1,554 B]
Get:2 Upgrade tool [1,336 kB]
Fetched 1,338 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
Get:1 http://archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Hit http://archive.canonical.com/ubuntu bionic InRelease
Get:2 http://archive.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Fetched 177 kB 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
Get:1 http://archive.ubuntu.com/ubuntu focal InRelease [265 kB]
Get:2 http://archive.canonical.com/ubuntu focal InRelease [12.1 kB]
Get:3 http://archive.canonical.com/ubuntu focal/partner amd64 Packages [1,600 B]
Get:4 http://archive.canonical.com/ubuntu focal/partner i386 Packages [1,620 B]
Get:5 http://archive.canonical.com/ubuntu focal/partner Translation-en [804 B]
Get:6 http://archive.ubuntu.com/ubuntu focal-updates InRelease [111 kB]
Get:7 http://archive.ubuntu.com/ubuntu focal-security InRelease [107 kB]
Get:8 http://archive.ubuntu.com/ubuntu focal/main i386 Packages [718 kB]
Get:9 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages [970 kB]
Get:10 http://archive.ubuntu.com/ubuntu focal/main Translation-en [506 kB]
Get:11 http://archive.ubuntu.com/ubuntu focal/main amd64 DEP-11 Metadata [494 kB]
Get:12 http://archive.ubuntu.com/ubuntu focal/main DEP-11 48x48 Icons [98.4 kB]
Get:13 http://archive.ubuntu.com/ubuntu focal/main DEP-11 64x64 Icons [163 kB]
Get:14 http://archive.ubuntu.com/ubuntu focal/main amd64 c-n-f Metadata [29.5 kB]
Get:15 http://archive.ubuntu.com/ubuntu focal/restricted amd64 Packages [22.0 kB]
Get:16 http://archive.ubuntu.com/ubuntu focal/restricted i386 Packages [8,112 B]
Get:17 http://archive.ubuntu.com/ubuntu focal/restricted Translation-en [6,212 B]
Get:18 http://archive.ubuntu.com/ubuntu focal/restricted amd64 c-n-f Metadata [392 B]
Get:19 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages [8,628 kB]
Get:20 http://archive.ubuntu.com/ubuntu focal/universe i386 Packages [4,642 kB]
Get:21 http://archive.ubuntu.com/ubuntu focal/universe Translation-en [5,124 kB]
Get:22 http://archive.ubuntu.com/ubuntu focal/universe amd64 DEP-11 Metadata [3,603 kB]
Get:23 http://archive.ubuntu.com/ubuntu focal/universe DEP-11 48x48 Icons [3,016 kB]
Get:24 http://archive.ubuntu.com/ubuntu focal/universe DEP-11 64x64 Icons [7,794 kB]
Get:25 http://archive.ubuntu.com/ubuntu focal/universe amd64 c-n-f Metadata [265 kB]
Get:26 http://archive.ubuntu.com/ubuntu focal/multiverse i386 Packages [74.7 kB]
Get:27 http://archive.ubuntu.com/ubuntu focal/multiverse amd64 Packages [144 kB]
Get:28 http://archive.ubuntu.com/ubuntu focal/multiverse Translation-en [104 kB]
Get:29 http://archive.ubuntu.com/ubuntu focal/multiverse amd64 DEP-11 Metadata [48.4 kB]
Get:30 http://archive.ubuntu.com/ubuntu focal/multiverse DEP-11 48x48 Icons [23.1 kB]
Get:31 http://archive.ubuntu.com/ubuntu focal/multiverse DEP-11 64x64 Icons [192 kB]
Get:32 http://archive.ubuntu.com/ubuntu focal/multiverse amd64 c-n-f Metadata [9,136 B]
Get:33 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages [636 kB]
Get:34 http://archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [364 kB]
Get:35 http://archive.ubuntu.com/ubuntu focal-updates/main Translation-en [160 kB]
Get:36 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 DEP-11 Metadata [229 kB]
Get:37 http://archive.ubuntu.com/ubuntu focal-updates/main DEP-11 48x48 Icons [50.7 kB]
Get:38 http://archive.ubuntu.com/ubuntu focal-updates/main DEP-11 64x64 Icons [81.7 kB]
Get:39 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 c-n-f Metadata [10.8 kB]
Get:40 http://archive.ubuntu.com/ubuntu focal-updates/restricted i386 Packages [12.0 kB]
Get:41 http://archive.ubuntu.com/ubuntu focal-updates/restricted amd64 Packages [80.8 kB]
Get:42 http://archive.ubuntu.com/ubuntu focal-updates/restricted Translation-en [12.8 kB]
Get:43 http://archive.ubuntu.com/ubuntu focal-updates/restricted amd64 c-n-f Metadata [348 B]
Get:44 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages [684 kB]
Get:45 http://archive.ubuntu.com/ubuntu focal-updates/universe i386 Packages [509 kB]
Get:46 http://archive.ubuntu.com/ubuntu focal-updates/universe Translation-en [131 kB]
Get:47 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 DEP-11 Metadata [205 kB]
Get:48 http://archive.ubuntu.com/ubuntu focal-updates/universe DEP-11 48x48 Icons [109 kB]
Get:49 http://archive.ubuntu.com/ubuntu focal-updates/universe DEP-11 64x64 Icons [204 kB]
Get:50 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 c-n-f Metadata [12.9 kB]
Get:51 http://archive.ubuntu.com/ubuntu focal-updates/multiverse i386 Packages [4,372 B]
Get:52 http://archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 Packages [15.1 kB]
Get:53 http://archive.ubuntu.com/ubuntu focal-updates/multiverse Translation-en [3,892 B]
Get:54 http://archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 DEP-11 Metadata [2,468 B]
Get:55 http://archive.ubuntu.com/ubuntu focal-updates/multiverse DEP-11 48x48 Icons [29 B]
Get:56 http://archive.ubuntu.com/ubuntu focal-updates/multiverse DEP-11 64x64 Icons [2,638 B]
Get:57 http://archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 c-n-f Metadata [480 B]
Get:58 http://archive.ubuntu.com/ubuntu focal-security/main i386 Packages [145 kB]
Get:59 http://archive.ubuntu.com/ubuntu focal-security/main amd64 Packages [350 kB]
Get:60 http://archive.ubuntu.com/ubuntu focal-security/main Translation-en [80.0 kB]
Get:61 http://archive.ubuntu.com/ubuntu focal-security/main amd64 DEP-11 Metadata [24.3 kB]
Get:62 http://archive.ubuntu.com/ubuntu focal-security/main DEP-11 48x48 Icons [11.0 kB]
Get:63 http://archive.ubuntu.com/ubuntu focal-security/main DEP-11 64x64 Icons [16.5 kB]
Get:64 http://archive.ubuntu.com/ubuntu focal-security/main amd64 c-n-f Metadata [5,176 B]
Get:65 http://archive.ubuntu.com/ubuntu focal-security/restricted amd64 Packages [66.5 kB]
Get:66 http://archive.ubuntu.com/ubuntu focal-security/restricted i386 Packages [8,920 B]
Get:67 http://archive.ubuntu.com/ubuntu focal-security/restricted Translation-en [10.9 kB]
Get:68 http://archive.ubuntu.com/ubuntu focal-security/restricted amd64 c-n-f Metadata [324 B]
Get:69 http://archive.ubuntu.com/ubuntu focal-security/universe i386 Packages [408 kB]
Get:70 http://archive.ubuntu.com/ubuntu focal-security/universe amd64 Packages [516 kB]
Get:71 http://archive.ubuntu.com/ubuntu focal-security/universe Translation-en [66.1 kB]
Get:72 http://archive.ubuntu.com/ubuntu focal-security/universe amd64 DEP-11 Metadata [56.5 kB]
Get:73 http://archive.ubuntu.com/ubuntu focal-security/universe DEP-11 48x48 Icons [23.0 kB]
Get:74 http://archive.ubuntu.com/ubuntu focal-security/universe DEP-11 64x64 Icons [40.9 kB]
Get:75 http://archive.ubuntu.com/ubuntu focal-security/universe amd64 c-n-f Metadata [9,204 B]
Get:76 http://archive.ubuntu.com/ubuntu focal-security/multiverse amd64 Packages [1,256 B]
Get:77 http://archive.ubuntu.com/ubuntu focal-security/multiverse Translation-en [540 B]
Get:78 http://archive.ubuntu.com/ubuntu focal-security/multiverse amd64 c-n-f Metadata [116 B]
Fetched 42.5 MB in 6s (3,803 kB/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 1:18.04.40
ProcVersionSignature: Ubuntu 4.15.0-122.124-generic 4.15.18
Uname: Linux 4.15.0-122-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.18
Architecture: amd64
CrashDB: ubuntu
Date: Thu Oct 29 10:30:33 2020
InstallationDate: Installed on 2018-12-11 (688 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-10-29 (0 days ago)

[lotuspsychje (lotuspsychje)]

Thank you for reporting this bug and make ubuntu better!

Please try ppapurge all your external added packages and ppa's yourself manually first

and sudo apt update && sudo apt full-upgrade

then try again the lts upgrade

[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.