[Trisquel-users] Re : Initramfs problems ...

[lcerf]

Nowadays, 100MB is not enough for /boot.  Do not bypass the problem: solve  
it.  I would try to boot a live system, copy (with 'cp -a') the content of  
the /boot partition on the respective directory on the root partition.  You  
can then delete the small /boot partition (e.g., using GParted) and extend  
the root partition (or any other adjacent partition) to not lose the freed  
space.  Then you would have to remove the respective line in /etc/fstab.   
Finally, you need to 'chroot' (see  
https://help.ubuntu.com/community/Grub2/Installing#via_ChRoot) the root  
partition to then 'update-grub'.

Reinstalling is an option too...
And, of course, always backup your data.