Update Manager: Discrepancy in kernel version and changelog between list of updates and Kernels dialog

Describe the bug In the Update Manager, the main list of available updates shows a version of 4.15.0.42.44. When I click the Changelog link for the 4.15.0-42 kernel in the Kernels dialog, it loads the page in firefox for the 4.15.0-42.45 version. The last part of the version number is different. Also the changelog output is different between the two. Together these make it appear that the Kernels dialog and the main list of available updates are out of sync.

To Reproduce Steps to reproduce the behavior:

After a fresh install, make sure to apply all of the package updates with this command in the terminal: sudo apt-get update; sudo apt-get upgrade -y; sudo apt-get dist-upgrade -y;
Restart the system and log back in
Launch the Update Manager app and wait for the list of updates to refresh.
Notice the available kernel update has a version of 4.15.0.42.44.
Select that update and click the Changelog tab at the bottom.
Take note of the output for the changelog.
Don't install the update yet.
Click the View menu item and select the "Linux kernels" option.
Click the Continue button if needed to go to the list of kernels.
Select the 4.15.0-42 kernel at the top and click the Changelog link
When firefox loads the page, notice that the version is slightly different with the last number being 45 instead of 44. Also notice that the changelog output is very different than the previous output.

Expected behavior Overall I expected the version number and the changelog output to be identical between the various places they are provided so that the user experience of viewing and choosing a kernel update to apply is consistent.

I realize the changelog website might be providing more level of detail than the tab in the Update Manager, but I expected at least the versions to be the same.

Frequency Does the issue happen:

[x] Always
[ ] Randomly

Edition (Desktop environment): In which edition is this happening?

[x] Cinnamon Edition
[ ] MATE Edition
[ ] Xfce Edition

Live or post-install: Indicate if this is happening after the installation, or during the live session:

[x] Post-install
[ ] Live session

Screenshots Screenshot of the list of updates: kernel_version_update_list

Screenshot of the changelog website: kernel_version_kernel_list

Locale: Paste the output of locale.

LANG=en_US.UTF-8
LANGUAGE=en_US
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=

Drivers: Paste the output of inxi -Gxx.

Graphics:  Device-1: InnoTek Systemberatung VirtualBox Graphics Adapter driver: vboxvideo v: kernel bus ID: 00:02.0 
           chip ID: 80ee:beef 
           Display: x11 server: X.Org 1.19.6 driver: modesetting unloaded: fbdev,vesa alternate: vboxvideo 
           resolution: 1920x1007~60Hz 
           OpenGL: renderer: llvmpipe (LLVM 6.0 256 bits) v: 3.3 Mesa 18.0.5 compat-v: 3.0 direct render: Yes

linuxmint / mint-19.1-beta

Update Manager: Discrepancy in kernel version and changelog between list of updates and Kernels dialog #86