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#Remove kernel packages that have been removed but not purged
dpkg -l | grep linux-image | grep "^rc" | cut -d' ' -f3 | xargs apt-get --purge remove -y

# Remove all kernel images except the current running one
sudo apt-get remove $(dpkg -l *linux-image-[0-9]* | grep ii | grep -v $(uname -r) | awk '{print $2}')

# Remove old dkms that are left due to bug; https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=717584
rm /boot/*.old-dkms