Help! My disk is full?!

Find how much disk space is used
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df

Find version of running kernel
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uname -a

Try to use apt-get to clean up
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apt-get	clean       : removes installers that are not needed
apt-get autoremove  : uninstalls packages that are no longer needed


Try to recover apt-get
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apt-get -f install
dpkg --configure -a


Try to recover more space if necessary
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Remove /lib/modules directories for kernels older than current kernel
Remove /usr/src directories for kernels older than current kernel
Remove /boot files for kernels older than current running kernel

Reboot to newer kernel
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reboot
citv showvm : until shutdown
citv bootvm machine_name c

Finish up
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Repeat the apt-get clean up
Make sure you really have plenty of disk space free