someone here once told me to
"df -h"
"df -i"
and then
"sudo apt-get autoremove && sudo apt-get autoclean".
and then
"dpkg -l | grep linux-headers" and put that into a pastebin
and then
"sudo rm -rf /usr/src/linux-headers-3.13.0-4*"
and then
"df -h" and -i again
and then
"sudo apt-get install -f"
and then
"echo $(dpkg --list | grep linux-image | awk '{ print $2 }' | sort -V | sed -n '/'`uname -r`'/q;p') $(dpkg --list | grep linux-headers | awk '{ print $2 }' | sort -V | sed -n '/'"$(uname -r | sed "s/\([0-9.-]*\)-\([^0-9]\+\)/\1/")"'/q;p') | xargs sudo apt-get -y purge"