Public bug reported:

On an up to date Xenial with Prompt=LTS

$ do-release-upgrade -cd
ERROR:root:parse failed for 
'/var/lib/update-manager/meta-release-lts-development'
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py", line 
240, in parse
    while index_tag.step():
SystemError: E:Unable to parse package file  (1)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py", line 
372, in download
    self.parse()
  File "/usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py", line 
278, in parse
    self.METARELEASE_URI)
UpdateManager.Core.MetaRelease.MetaReleaseParseError: Unable to parse 
http://changelogs.ubuntu.com/meta-release-lts-development
Checking for a new Ubuntu release
Upgrades to the development release are only
available from the latest supported release.

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

** Description changed:

- On an up to date Xenial
+ On an up to date Xenial with Prompt=LTS
  
  $ do-release-upgrade -cd
  ERROR:root:parse failed for 
'/var/lib/update-manager/meta-release-lts-development'
  Traceback (most recent call last):
-   File "/usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py", 
line 240, in parse
-     while index_tag.step():
+   File "/usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py", 
line 240, in parse
+     while index_tag.step():
  SystemError: E:Unable to parse package file  (1)
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
-   File "/usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py", 
line 372, in download
-     self.parse()
-   File "/usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py", 
line 278, in parse
-     self.METARELEASE_URI)
+   File "/usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py", 
line 372, in download
+     self.parse()
+   File "/usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py", 
line 278, in parse
+     self.METARELEASE_URI)
  UpdateManager.Core.MetaRelease.MetaReleaseParseError: Unable to parse 
http://changelogs.ubuntu.com/meta-release-lts-development
  Checking for a new Ubuntu release
- Upgrades to the development release are only 
+ Upgrades to the development release are only
  available from the latest supported release.

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https://bugs.launchpad.net/bugs/1723115

Title:
  do-release-upgrade -cd on xenial fails with "Parse failed on meta-
  release-lts-development"

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