Server update problem

Dear,
How to further perform software update to Ubuntu 18 due to issue like "264 not upgraded"?

Found kernel: /vmlinuz-4.15.0-143-generic
Found kernel: /vmlinuz-4.15.0-142-generic
Found kernel: /vmlinuz-4.15.0-141-generic
Found kernel: /memtest86+.bin
Replacing config file /run/grub/menu.lst with new version
Found kernel: /vmlinuz-4.15.0-143-generic
Found kernel: /vmlinuz-4.15.0-142-generic
Found kernel: /memtest86+.bin
Replacing config file /run/grub/menu.lst with new version
Updating /boot/grub/menu.lst ... done

/etc/kernel/postrm.d/zz-update-grub:
Sourcing file `/etc/default/grub'
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.15.0-143-generic
Found initrd image: /boot/initrd.img-4.15.0-143-generic
Found linux image: /boot/vmlinuz-4.15.0-142-generic
Found initrd image: /boot/initrd.img-4.15.0-142-generic
Found memtest86+ image: /memtest86+.elf
Found memtest86+ image: /memtest86+.bin
done
Removing linux-modules-4.15.0-141-generic (4.15.0-141.145) ...
Processing triggers for libc-bin (2.27-3ubuntu1.2) ...
root@ubuntu1604:/home/rem01# apt install software-properties-common
Reading package lists... Done
Building dependency tree
Reading state information... Done
software-properties-common is already the newest version (0.96.24.32.14).
0 upgraded, 0 newly installed, 0 to remove and 264 not upgraded.