[Bug 1930369] [NEW] Kubuntu 20.10 does not offer release upgrade to 21.04

[libcha]

Public bug reported:

I tried to upgrade to 21.04 release according to documentation, but the upgrader claims there is no release to be upgraded to:
```
root at peltan:/home/peltan# pkexec do-release-upgrade -m desktop -f DistUpgradeViewKDE
Checking for a new Ubuntu release
No new release found.
root at peltan:/home/peltan# do-release-upgrade -m desktop
Checking for a new Ubuntu release
No new release found.
root at peltan:/home/peltan# cat /etc/issue
Ubuntu 20.10 \n \l

root at peltan:/home/peltan# 
```

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

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https://bugs.launchpad.net/bugs/1930369

Title:
  Kubuntu 20.10 does not offer release upgrade to 21.04

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

Bug description:
  I tried to upgrade to 21.04 release according to documentation, but the upgrader claims there is no release to be upgraded to:
  ```
  root at peltan:/home/peltan# pkexec do-release-upgrade -m desktop -f DistUpgradeViewKDE
  Checking for a new Ubuntu release
  No new release found.
  root at peltan:/home/peltan# do-release-upgrade -m desktop
  Checking for a new Ubuntu release
  No new release found.
  root at peltan:/home/peltan# cat /etc/issue
  Ubuntu 20.10 \n \l

  root at peltan:/home/peltan# 
  ```

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