[Bug 1916309] [NEW] Cannot upgrade to 20.10 from 20.04

[Luis Alberto Pabón]

Public bug reported:

I'm trying to upgrade to 20.10 from 20.04 to no avail:

```
root at luis-XPS-15-9560 /h/luis# DEBUG_UPDATE_MANAGER=1 do-release-upgrade -d
Checking for a new Ubuntu release
MetaRelease.__init__() useDevel=True useProposed=False
/etc/update-manager/meta-release: https://changelogs.ubuntu.com/meta-release 
/etc/update-manager/meta-release: https://changelogs.ubuntu.com/meta-release-lts 
/etc/update-manager/meta-release: -development 
/etc/update-manager/meta-release: -proposed 
metarelease-uri: https://changelogs.ubuntu.com/meta-release-development
MetaRelease.download()
have self.metarelease_information
MetaRelease.parse()
current dist name: 'focal'
found distro name: 'groovy'
found distro name: 'hirsute'
current dist not found in meta-release file

Upgrades to the development release are only 
available from the latest supported release.

~ lsb_release -a

No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 20.04.2 LTS
Release:	20.04
Codename:	focal

```

/etc/update-manager/release-upgrades has:
```
[DEFAULT]
Prompt=normal
```

/var/lib/update-manager/meta-release has entries for focal, groovy and
hirsute: https://paste.ubuntu.com/p/dRkW8ZG5Df/

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.30
ProcVersionSignature: Ubuntu 5.8.0-43.49~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-43-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: sway
Date: Fri Feb 19 23:45:03 2021
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.apport.crashdb.conf: 2021-01-11T10:06:24.732377
mtime.conffile..etc.update-manager.release-upgrades: 2021-02-19T23:33:06.852046

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade focal wayland-session

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https://bugs.launchpad.net/bugs/1916309

Title:
  Cannot upgrade to 20.10 from 20.04

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

Bug description:
  I'm trying to upgrade to 20.10 from 20.04 to no avail:

  ```
  root at luis-XPS-15-9560 /h/luis# DEBUG_UPDATE_MANAGER=1 do-release-upgrade -d
  Checking for a new Ubuntu release
  MetaRelease.__init__() useDevel=True useProposed=False
  /etc/update-manager/meta-release: https://changelogs.ubuntu.com/meta-release 
  /etc/update-manager/meta-release: https://changelogs.ubuntu.com/meta-release-lts 
  /etc/update-manager/meta-release: -development 
  /etc/update-manager/meta-release: -proposed 
  metarelease-uri: https://changelogs.ubuntu.com/meta-release-development
  MetaRelease.download()
  have self.metarelease_information
  MetaRelease.parse()
  current dist name: 'focal'
  found distro name: 'groovy'
  found distro name: 'hirsute'
  current dist not found in meta-release file

  Upgrades to the development release are only 
  available from the latest supported release.

  ~ lsb_release -a

  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 20.04.2 LTS
  Release:	20.04
  Codename:	focal

  ```

  /etc/update-manager/release-upgrades has:
  ```
  [DEFAULT]
  Prompt=normal
  ```

  /var/lib/update-manager/meta-release has entries for focal, groovy and
  hirsute: https://paste.ubuntu.com/p/dRkW8ZG5Df/

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.30
  ProcVersionSignature: Ubuntu 5.8.0-43.49~20.04.1-generic 5.8.18
  Uname: Linux 5.8.0-43-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.16
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CurrentDesktop: sway
  Date: Fri Feb 19 23:45:03 2021
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: No upgrade log present (probably fresh install)
  mtime.conffile..etc.apport.crashdb.conf: 2021-01-11T10:06:24.732377
  mtime.conffile..etc.update-manager.release-upgrades: 2021-02-19T23:33:06.852046

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