This bug was fixed in the package initramfs-tools - 0.131ubuntu11
--------------- initramfs-tools (0.131ubuntu11) cosmic; urgency=medium
* debian/initramfs-tools.postinst: remove orphaned old-dkms initrd files in /boot. (LP: #1791959)
-- Tiago Stürmer Daitx <email address hidden> Wed, 12 Sep 2018 12:06:58 +0000
This bug was fixed in the package initramfs-tools - 0.131ubuntu11
---------------
initramfs-tools (0.131ubuntu11) cosmic; urgency=medium
* debian/ initramfs- tools.postinst: remove orphaned old-dkms initrd files
in /boot. (LP: #1791959)
-- Tiago Stürmer Daitx <email address hidden> Wed, 12 Sep 2018 12:06:58 +0000