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If you update to newer linux kernels the old kernels stay on the disc. Each kernel need about 60 - 140 MB. To remove them you have to open a terminal:
To rmeove former Linux kernels execute in a terminal:
sudo dpkg -l | grep linux-image (Enter)
The result should look like
ii linux-image-3.2.0-31-generic 3.2.0-31.50 Linux kernel image for version 3.2.0 on 64 bit x86 SMP
ii linux-image-3.2.0-32-generic 3.2.0-32.51 Linux kernel image for version 3.2.0 on 64 bit x86 SMP
ii linux-image-3.2.0-33-generic 3.2.0-33.52 Linux kernel image for version 3.2.0 on 64 bit x86 SMP
ii linux-image-generic 3.2.0.33.36
In this example you might delete the kernels 3.2.0-31 and 3.2.0-32 (the numbers might differ from your list, please exchange). The last 2 kernels with the higher release numbers shoud remain:
sudo apt-get remove --purge linux-image-3.2.0-31-generic (Enter)
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Open a terminal