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How to reproduce:
1. Go to cdimage.ubuntu.com, choose any flavor and navigate to release or 
daily-live folder.
2. Copy (link address of) the .zsync file.
3. Open a terminal and try to perform zsync download with the copied zsync URL.

Expected:
Zsync download happens normally.

Actual:
Zsync download fails with error '...could not read control file from URL'. 

Below is an example error (for Ubuntu 21.10 20210507 daily build iso):

```
zsync 
https://cdimage.ubuntu.com/ubuntu/daily-live/20210507/impish-desktop-amd64.iso.zsync
failed on url 
https://cdimage.ubuntu.com/ubuntu/daily-live/20210507/impish-desktop-amd64.iso.zsync
could not read control file from URL 
https://cdimage.ubuntu.com/ubuntu/daily-live/20210507/impish-desktop-amd64.iso.zsync
```

If we change the protocol to `http` instead of `https` the zsync
function works.

This is happening for all flavors.

Suggested solution: Change/keep all zsync file's address to use `http`
till (if) zsync software supports `https` protocol.

** Affects: zsync (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: impish iso-testing
-- 
"https" address causes zsync download to fail with error 'could not read 
control file from URL'
https://bugs.launchpad.net/bugs/1927807
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