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I'm on Ubuntu 18.04.1 LTS and this red triangle sign (top right on the image) appears often, and when I click there and then click Install all updates nothing happens. This occurs often and is a burden.

enter image description here

What exactly does it mean that red triangle and when does it appear? That there are updates, or upgrades?

shall I do?

sudo apt-get update -y
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    Yes, you can always run sudo apt-get update and sudo apt-get upgrade anytime. – Terrance Jan 10 at 0:04
  • Please edit your question to include the complete output of sudo apt update and ls -la /var/lib/apt/periodic – user535733 Jan 10 at 0:12
  • @Terrance but that sign refers to updates, upgrades or both? – João Pimentel Ferreira Jan 10 at 19:21
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    @JoãoPimentelFerreira I think upgrades and it is one that are getting stuck maybe because they need to have sudo apt dist-upgrade performed on them. That happens when you see apps that are getting held back. – Terrance Jan 10 at 19:22
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Now I understand the problem, because it's merely a problem of terminology.

What ubuntu in the top right corner GUI defines as "install updates" it's not solved by the command sudo apt update because this command merely downloads the latest version of available packages, but it's solved by sudo apt upgrade, which indeed install new versions of the packages already installed.

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