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The update green icon is the icon that pop-up and informs that you can install updates, or you can choose to be informed later.

I wanted to install them now, but I accidentally clicked "Remind me later", instead of "Install now".

How to summon the icon again so I can do the right thing?

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up vote 7 down vote accepted

It's called "Software Updater". You can open it from the dash:

enter image description here

It will then check for updates and let you install them, as well as change update related settings.

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You can run updates via terminal as well using the commands :

sudo apt-get update
sudo apt-get dist-upgrade
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I was looking for Seth's answer, but I will give you a +1 for answering. – gsamaras Feb 16 at 23:36
One should prefer apt-get upgrade over apt-get dist-upgrade whenever it's not necessarily needed... – Byte Commander Feb 17 at 9:08

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