[Bug 1851040] Re: "No valid sources.list entry found" during attempt to upgrade from Eoan to Focal

[Norbert]

Upgrade from fails too:

```
$ sudo do-release-upgrade -d
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [1 554 B]                                         
Get:2 Upgrade tool [1 334 kB]                                                  
45% [2  606 kB/1 334 kB 45%]                                             Fetched 1 335 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 eoan InRelease                     
Get:1 http://security.ubuntu.com/ubuntu eoan-security InRelease [92,9 kB]
Hit http://archive.ubuntu.com/ubuntu eoan-updates InRelease             
Hit http://archive.ubuntu.com/ubuntu eoan-backports InRelease           
Fetched 92,9 kB in 0s (0 B/s)                                           
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

Updating repository information

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?

Continue [yN]

Restoring original system state

Aborting
Reading package lists... Done    
Building dependency tree          
Reading state information... Done
```

-- 
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https://bugs.launchpad.net/bugs/1851040

Title:
  "No valid sources.list entry found" during attempt to upgrade from
  Eoan to Focal

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

Bug description:
  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:

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