update-manager may display a different kind of error when going to install
(kernel) updates i.e. new kernel(s): https://i.stack.imgur.com/DppOi.png
The actions suggested by the dialog (i.e. emptying trash and running 'sudo
apt-get clean' do not help, if /boot is in a separate partition. 'sudo apt
autoremove --purge' would be an option in 16.04 and later.
Related: Bug #1460396
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free disk space check could actually carry out suggested ways to clear
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