[Bug 1789019] [NEW] update-manager asks for installing updates but shows no list of update, just an empty box…

[Coeur Noir]

Public bug reported:

Hi,

seen on 16.04 ( unity ) and 18.04 ( default DE ), affecting many users
and not systematic :

sometimes update-manager asks for installing updates but does not show
any list of available updates.

At the very same moment, commands sudo apt update or sudo apt list
--upgradable work as expected.

for reference : https://forum.ubuntu-fr.org/viewtopic.php?id=2029394 (
french )

For last example shown in attached picture, the ( almost ) exact same
list of updates appeared correctly in UbuntuBudgie's update-manager… (
on the same machine but booted from another disc partition ).

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "screenshot on ubuntu 18.04"
   https://bugs.launchpad.net/bugs/1789019/+attachment/5180695/+files/1804_gestionnr_maj_vide.png

** Description changed:

  Hi,
  
  seen on 16.04 ( unity ) and 18.04 ( default DE ), affecting many users
  and not systematic :
  
  sometimes update-manager asks for installing updates but does not show
  any list of available updates.
  
  At the very same moment, commands sudo apt update or sudo apt list
  --upgradable work as expected.
  
  for reference : https://forum.ubuntu-fr.org/viewtopic.php?id=2029394 (
  french )
  
- For last example shown in attached picture, the exact same list of
- updates appeared correctly in UbuntuBudgie's update-manager… ( on the
- same machine but booted from another disc partition ).
+ For last example shown in attached picture, the ( almost ) exact same
+ list of updates appeared correctly in UbuntuBudgie's update-manager… (
+ on the same machine but booted from another disc partition ).

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https://bugs.launchpad.net/bugs/1789019

Title:
  update-manager asks for installing updates but shows no list of
  update, just an empty box…

Status in update-manager package in Ubuntu:
  New

Bug description:
  Hi,

  seen on 16.04 ( unity ) and 18.04 ( default DE ), affecting many users
  and not systematic :

  sometimes update-manager asks for installing updates but does not show
  any list of available updates.

  At the very same moment, commands sudo apt update or sudo apt list
  --upgradable work as expected.

  for reference : https://forum.ubuntu-fr.org/viewtopic.php?id=2029394 (
  french )

  For last example shown in attached picture, the ( almost ) exact same
  list of updates appeared correctly in UbuntuBudgie's update-manager… (
  on the same machine but booted from another disc partition ).

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