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When updating my Ubuntu from 12.10 to 13.04 I get the message

'Your boot folder is too small, make more space' 

although my harddrive has still plenty of place left.

How can I make that boot folder bigger?

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Does your boot folder lives on a different partition? Maybe that partition is too small to add another kernel image. – user85164 May 9 '13 at 23:29
show us the result of df -H. Mind you: if you have a /boot in there ... that partition is too small;so remove kernels ;) – Rinzwind May 10 '13 at 0:52
I get a pop up when trying to update my Ubuntu. The upgrade needs a total of 26.7M free space on disk'/boot'. Please free at least an additional 10.6M of disk space on '/boot'. Empty your trash and temp packages of former installation using sudo apt-get clean I tried this and above and I am not able to clear out more files. I am not allowed to delete files. I am the admin on the computer. – user254570 Mar 4 '14 at 8:46

Determine which kernel you're running, via uname -r. Remember this - don't delete anything with this version.

See which kernels, tools, etc you have installed, with:

dpkg -l linux-image\*
dpkg -l linux-headers\*
dpkg -l linux-tools\*

Carefully avoiding the current version (shown by uname -r), delete older versions using sudo apt-get remove ... and sudo apt-get purge ....

If you can't get enough space the above way, you'll have to switch to Plan B.

Plan B is:

Read man gparted

Boot from a live CD containing gparted.

Use gparted to shrink one of the partitions next to /boot, and expand /boot into the newly freed space.

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