커널 때문에...

mogibu@mogibu:~$ sudo apt-get install linux-image-4.14.40-131

Reading package lists... Done

Building dependency tree       

Reading state information... Done

linux-image-4.14.40-131 is already the newest version (20180514).

linux-image-4.14.40-131 set to manually installed.

0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

mogibu@mogibu:~$  apt-mark showauto | grep linux-image

mogibu@mogibu:~$ uname -r

4.14.37-130

mogibu@mogibu:~$  apt-mark showmanual | grep linux-image

linux-image-4.14.40-131

linux-image-xu3

mogibu@mogibu:~$ uname -sr

Linux 4.14.37-130

==================

dpkg -l | grep linux-image*

rc  linux-image-3.10.103-123  20160926 armhf Linux kernel binary image for version 3.10.103-123

rc  linux-image-3.10.103-124  20161011 armhf Linux kernel binary image for version 3.10.103-124

rc  linux-image-3.10.104-132              20170221                                   armhf        Linux kernel binary image for version 3.10.104-132

rc  linux-image-3.10.96-101               20160702                                   armhf        Linux kernel binary image for version 3.10.96-101

rc  linux-image-3.10.96-110               20160704                                   armhf        Linux kernel binary image for version 3.10.96-110

rc  linux-image-3.10.96-113               20160706                                   armhf        Linux kernel binary image for version 3.10.96-113

rc  linux-image-3.10.96-114               20160707                                   armhf        Linux kernel binary image for version 3.10.96-114

rc  linux-image-4.14.37-130               20180430                                   armhf        Linux kernel binary image for version 4.14.37-130

ii  linux-image-4.14.40-131               20180514                                   armhf        Linux kernel binary image for version 4.14.40-131

rc  linux-image-4.9.11-7                  20170222                                   armhf        Linux kernel binary image for version 4.9.11-7

rc  linux-image-4.9.11-8                  20170222                                   armhf        Linux kernel binary image for version 4.9.11-8

rc  linux-image-4.9.27-34                 20170508                                   armhf        Linux kernel binary image for version 4.9.27-34

rc  linux-image-4.9.27-35                 20170509                                   armhf        Linux kernel binary image for version 4.9.27-35

rc  linux-image-4.9.44-54                 20170820                                   armhf        Linux kernel binary image for version 4.9.44-54

rc  linux-image-4.9.58-71                 20171025                                   armhf        Linux kernel binary image for version 4.9.58-71

ii  linux-image-xu3                       131-1                                      armhf        ODROID Kernel for 5422 based products.

So for example:

ii means 'It should be installed and it is installed' whereas
rc means 'It's removed/uninstalled but it's configuration files are still there'