Can't update: low space in /boot (LVM) - I already cleaned my Lubuntu with Ubuntu Tweak

I have low space on /boot partition and I can't update my Lubuntu. I have LVM. I deleted old kernels and used Ubuntu Tweak.

I tried to loaded from LiveCD and with gparted grow up my /boot-size, but gparted not giving me ability to make more space for /boot - only to shrink.

I see hidden folder .Trash-0 in my /boot with old kernels. I can't delete any file in this folder - they are recreating with new number in name. I have empty trash can. How I can delete this files?

I have deleted kernels in hidden folder /boot/.Trash-0. I fix my problem by deleting files in this folder by pressing SHIFT + DEL.