I am seeing this on focal, when running command:

$ add-apt-repository ppa:snappy-dev/image -y

on 20.04. 22.04 seems to be fine.

The errors I see are of the same two types as those in the bug
description:

<<
Cannot add PPA: 'ppa:~snappy-dev/ubuntu/image'.
The team named '~snappy-dev' has no PPA named 'ubuntu/image'
Please choose from the following available PPAs:
 * '15.04':  DEPRECATED - WILL REMOVE SOON (Tools for Snappy 15.04)
 * 'beta':  Snappy beta
 * 'edge':  Snappy Edge
 * 'image':  Packages used in constructing the Ubuntu Core component of Snappy
...
>>

or the backtrace:

<<
Traceback (most recent call last):
  File "/usr/bin/add-apt-repository", line 137, in <module>
    shortcut = shortcut_handler(line)
  File 
"/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 
885, in shortcut_handler
    ret = factory(shortcut)
  File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 469, in 
shortcut_handler
    return PPAShortcutHandler(shortcut)
  File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 426, in 
__init__
    info = get_ppa_info(self.shortcut)
  File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 392, in 
get_ppa_info
    _get_suggested_ppa_message(user, ppa))
  File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 349, in 
_get_suggested_ppa_message
    lp_user = get_info_from_lp(LAUNCHPAD_USER_API % user)
  File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 104, in 
get_info_from_lp
    return get_info_from_https(lp_url, True)
  File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 98, in 
get_info_from_https
    return json.loads(data)
  File "/usr/lib/python3.8/json/__init__.py", line 357, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python3.8/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python3.8/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
>>

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https://bugs.launchpad.net/bugs/2039411

Title:
  Addition of ppa repository failing intermittently

Status in software-properties package in Ubuntu:
  Confirmed

Bug description:
  I get following error intermittently when trying to add ppa repository:
  $ sudo add-apt-repository ppa:~longsleep/ubuntu/golang-backports
  Cannot add PPA: 'ppa:~longsleep/ubuntu/golang-backports'.
  The user named '~longsleep' has no PPA named 'ubuntu/golang-backports'
  Please choose from the following available PPAs:
   * 'bcmwl':  bcmwl
   * 'couchdb':  Apache CouchDB
   * 'couchdb-precise-backport':  Apache CouchDB with Erlang 18 for precise
   * 'createrepo-backports':  Createrepo Backports
   * 'firehol-backports':  Firehol Backports
   * 'golang-backports':  Golang Backports
   * 'golang-backports-dev':  Golang Backports Dev
   * 'iridium-browser-dev':  Iridium Browser Dev dependencies
   * 'pixel-extras':  Pixel extras
   * 'python2.7-backports':  Python 2.7 Backports
   * 'python3-m2crypto-backports':  Python 3 M2Crypto backports
   * 'stuff':  Stuff
   * 'ubuntu-pine64-flavour-makers':  Ubuntu Pine64 Makers PPA

  After multiple attempts, it may succeed, but the same above command sometimes 
may return following error as well (intermittently):
  $ sudo add-apt-repository ppa:~longsleep/ubuntu/golang-backports
  Traceback (most recent call last):
    File "/usr/bin/add-apt-repository", line 137, in <module>
      shortcut = shortcut_handler(line)
    File 
"/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 
885, in shortcut_handler
      ret = factory(shortcut)
    File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 469, 
in shortcut_handler
      return PPAShortcutHandler(shortcut)
    File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 426, 
in __init__
      info = get_ppa_info(self.shortcut)
    File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 392, 
in get_ppa_info
      _get_suggested_ppa_message(user, ppa))
    File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 349, 
in _get_suggested_ppa_message
      lp_user = get_info_from_lp(LAUNCHPAD_USER_API % user)
    File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 104, 
in get_info_from_lp
      return get_info_from_https(lp_url, True)
    File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 98, 
in get_info_from_https
      return json.loads(data)
    File "/usr/lib/python3.8/json/__init__.py", line 357, in loads
      return _default_decoder.decode(s)
    File "/usr/lib/python3.8/json/decoder.py", line 337, in decode
      obj, end = self.raw_decode(s, idx=_w(s, 0).end())
    File "/usr/lib/python3.8/json/decoder.py", line 355, in raw_decode
      raise JSONDecodeError("Expecting value", s, err.value) from None
  json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

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