Ubuntu is still not able to do silent updates

Ubuntu does not remove old kernel/initrd versions from boot out of box. This configuration causes your /boot to grow till there is no space left. Of course you can fix this by dropping to terminal:

#sudo apt autoremove

To fix that silently on every run of apt upgrade i changed /etc/apt/apt.conf.d/50unattended-upgrades:

// Do automatic removal of new unused dependencies after the upgrade
// (equivalent to apt-get autoremove)
Unattended-Upgrade::Remove-Unused-Dependencies "true";

Source:

https://help.ubuntu.com/community/AutomaticSecurityUpdates

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