I see this same behaviour regularly on systems running 18.04 as well.
Running sudo apt update makes the update process resume - no errors shown.
Without doing that the system reports that it is up to date and it
isn't, making it unsafe.
Non techy users freak out on using a command line command.
** Tags added: xenial
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https://bugs.launchpad.net/bugs/1557215
Title:
"The update information is outdated" warning won't go away. No
information given about how to fix
To manage
** Changed in: update-manager (Ubuntu)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1557215
Title:
"The update information is outdated" warning won't go away. No
** Tags added: trusty
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https://bugs.launchpad.net/bugs/1557215
Title:
"The update information is outdated" warning won't go away. No
information given about how to fix
To manage
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: update-manager (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1557215
