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tarraschFlag for Germany

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How to know if rebooting the system is necessary after package upgrades?

If using a GUI, e.g. the default GNOME GUI on Ubuntu, after upgrading packages sometimes the information is displayed that rebooting the system is necessary.

When working on the command line e.g.
sudo apt-get update
sudo apt-get upgrade

or
sudo aptitude update
sudo aptitude safe-upgrade

usually no such information is offered.

How do I know? How do the GUI tools now?
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ShivanX

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I.e. if you apt-get upgrade ..did upgrade your kernel you will have to reboot to make use of it.
It does state that...but it does not ask you to reboot.
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Thank you!

May I assume that a package can indicate a reboot is necessary, so?
So far I did not upgrade a kernel image on the command line, for example.