When i do my updates, the /boot folder is always full with old stuff...
So, after a while, I can't make any updates/upgrades anymore, because the /boot folder is full.
I have to delete some stuff from /boot via sudo aptitude remove ...

I also have to remove from time to time my old headers and images...

Is that normal? My colleague, also with an Ubuntu does not have this problem
my du -h boot says:
3,4M /boot/efi/EFI/ubuntu
3,4M /boot/efi/EFI
3,4M /boot/efi
127K /boot/grub/locale
2,4M /boot/grub/fonts
2,9M /boot/grub/x86_64-efi
7,7M /boot/grub
12K /boot/lost+found
100M /boot