Public bug reported:
Steps to reproduce:
1. Have Ubuntu 19.10 installed (edition really does not matter, but tested on
MATE)
2. Run `update-manager -d -c `
3. Follow wizard, confirm upgrade to 20.04 LTS
Expected results:
* upgrade is started and ended successfully
Actual results:
* upgrade is not started, have the following window
```
No valid sources.list entry found
While scanning your repository information no entry about disco could be
found.
An upgrade might not succeed.
Do you want to continue anyway?
No Yes
```
Terminal output is the following:
```
$ update-manager -d -c
WARNING:root:can not import unity GI Namespace Dbusmenu not available
Checking for a new Ubuntu release
Checking for a new Ubuntu release
/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeFetcher.py:23:
PyGIWarning: Gtk was imported without specifying a version first. Use
gi.require_version('Gtk', '3.0') before import to ensure that the right version
gets loaded.
from gi.repository import Gtk, Gdk
/usr/lib/python3/dist-packages/DistUpgrade/ReleaseNotesViewerWebkit.py:33:
PyGIWarning: WebKit2 was imported without specifying a version first. Use
gi.require_version('WebKit2', '4.0') before import to ensure that the right
version gets loaded.
from gi.repository import WebKit2 as WebKit
error: XDG_RUNTIME_DIR not set in the environment.
authenticate 'focal.tar.gz' against 'focal.tar.gz.gpg'
extracting 'focal.tar.gz'
```
ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: ubuntu-release-upgrader-core 1:19.10.15
ProcVersionSignature: Ubuntu 5.3.0-19.20-generic 5.3.1
Uname: Linux 5.3.0-19-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.1
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: MATE
Date: Sat Nov 2 16:51:48 2019
InstallationDate: Installed on 2019-10-19 (14 days ago)
InstallationMedia: Ubuntu-MATE 19.10 "Eoan Ermine" - Release amd64 (20191017)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: Upgraded to eoan on 2019-11-02 (0 days ago)
VarLogDistupgradeAptlog:
Log time: 2019-11-02 16:49:52.579694
Log time: 2019-11-02 16:49:56.716523
VarLogDistupgradeTermlog:
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug dist-upgrade eoan iso-testing
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1851040
Title:
"No valid sources.list entry found" during attempt to upgrade from
Eoan to Focal
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1851040/+subscriptions
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