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The upgrade needs a total of 27.4 M free space on disk '/boot'. Please free at least an additional 9,027 k of disk space on '/boot'. Empty your trash and remove temporary packages of former installations using 'sudo apt-get clean'.

How to get free space for installing new updates? I checked the boot in the file system. There were different versions of the same thing. Can I just delete older versions by myself to get free space?

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It is a good idea to use

sudo apt-get autoremove

from time to time. Apt-get manpage says:

autoremove
     autoremove is used to remove packages that were automatically
     installed to satisfy dependencies for other packages and are now no
     longer needed.

This removes "remainings" of previous kernel versions and I'd bet it should free enough disk space in your case, too.

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I would simply remove some of the old boot files, and then run upgrade-grub. For example:

cd /boot
ls vmlinuz-*

Say, if you have

vmlinuz-3.13.0-24-generic
vmlinuz-3.2.0-57-generic

and want to remove all files with version 3.2.0-57, you could do:

sudo -s
remove *-3.2.0-57-*
update-grub

The last command fixes the grub boot menu to reflect the changes you've made.

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