How do I free up more space in /boot?

uname -r

dpkg -l linux-{image,headers}-“[0-9]*” | awk ‘/^ii/{ print $2}’ |  grep -v -e `uname -r | cut -f1,2 -d”-“` | grep -e ‘[0-9]’

dpkg -l linux-{image,headers}-“[0-9]*” | awk ‘/^ii/{ print $2}’ | grep -v -e `uname -r | cut -f1,2 -d”-“` | grep -e ‘[0-9]’ | xargs sudo apt-get -y purge