Help cleaning up disk drive/installations

Over the years I routinely upgrade/update my Ubuntu/Windows installation. Lately I have noticed an accumulation of kernals and related that I would like to remove (see below). I only want to keep Ubuntu and win10. What is a safe way to clean the rest of this up?


Generating grub configuration file ...
Found linux image: /boot/vmlinuz-5.3.0-45-generic
Found initrd image: /boot/initrd.img-5.3.0-45-generic
Found linux image: /boot/vmlinuz-5.3.0-42-generic
Found initrd image: /boot/initrd.img-5.3.0-42-generic
Found linux image: /boot/vmlinuz-5.3.0-40-generic
Found initrd image: /boot/initrd.img-5.3.0-40-generic
Found linux image: /boot/vmlinuz-4.15.0-91-generic
Found initrd image: /boot/initrd.img-4.15.0-91-generic
Found Windows Recovery Environment on /dev/sda1
Found Windows 10 on /dev/sda2
Found Windows 7 on /dev/sda3
Found Ubuntu 14.04.1 LTS - KODIbuntu (14.04) on /dev/sda6
Found linux image: /boot/vmlinuz-5.3.0-45-generic
Found initrd image: /boot/initrd.img-5.3.0-45-generic
Found linux image: /boot/vmlinuz-5.3.0-42-generic
Found initrd image: /boot/initrd.img-5.3.0-42-generic
Found linux image: /boot/vmlinuz-5.3.0-40-generic
Found initrd image: /boot/initrd.img-5.3.0-40-generic
Found linux image: /boot/vmlinuz-4.15.0-91-generic
Found initrd image: /boot/initrd.img-4.15.0-91-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
Found Windows Recovery Environment on /dev/sda1
Found Windows 10 on /dev/sda2
Found Windows 7 on /dev/sda3
Found Ubuntu 14.04.1 LTS - KODIbuntu (14.04) on /dev/sda6
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
Found Windows Recovery Environment on /dev/sda1
Found Windows 10 on /dev/sda2
Found Windows 7 on /dev/sda3
Found Ubuntu 14.04.1 LTS - KODIbuntu (14.04) on /dev/sda6