**TL;DR:**
----------
As of this writing, the lxpanel Updater applet somehow only updates the kernel modules without changing the system release. I want to know why, and point out that `apt` resolves issues.
## Backstory: ##
Today, I installed the following updates using the Updater applet in the `lxpanel` menubar on RPi OS:

```
apt list --installed | grep 202208

linux-libc-dev/stable,now 1:1.20220811-1 arm64 [installed,automatic]
raspberrypi-bootloader/stable,now 1:1.20220811-1 arm64 [installed]
raspberrypi-kernel/stable,now 1:1.20220811-1 arm64 [installed]
```

After rebooting following the prompt, I noticed the following symptoms:  

 1. My second monitor is stuck on the rainbow startup screen. Replugging it and checking `xrandr` show that it's not detected.

 2. None of the daemons started by kernel modules were running.

After `Ctrl+Alt+F1`ing into tty1, I see at the top:  
```
[    3.003542] systemd[1]: Failed to start Load Kernel Modules.  
[FAILED] Failed to start Load Kernel Modules.
```
with the rest of the normal login screen below that, indicating that I successfully booted using Kernel 5.15.32-v8+

`systemctl status systemd-modules-load.service -l` shows:
```
● systemd-modules-load.service - Load Kernel Modules
     Loaded: loaded (/lib/systemd/system/systemd-modules-load.service; static)
     Active: failed (Result: exit-code) since Mon 2022-08-15 16:11:02 PDT; 2h 13min ago
       Docs: man:systemd-modules-load.service(8)
             man:modules-load.d(5)
    Process: 234 ExecStart=/lib/systemd/systemd-modules-load (code=exited, status=1/FAILURE)
   Main PID: 234 (code=exited, status=1/FAILURE)
        CPU: 37ms

Aug 15 16:11:02 raspberrypi systemd[1]: Starting Load Kernel Modules...
Aug 15 16:11:02 raspberrypi systemd-modules-load[234]: Failed to look up module alias 'lp': Function not implemented
Aug 15 16:11:02 raspberrypi systemd-modules-load[234]: Failed to look up module alias 'ppdev': Function not implemented
Aug 15 16:11:02 raspberrypi systemd-modules-load[234]: Failed to look up module alias 'parport_pc': Function not implemented
Aug 15 16:11:02 raspberrypi systemd-modules-load[234]: Failed to look up module alias 'i2c-dev': Function not implemented
Aug 15 16:11:02 raspberrypi systemd[1]: systemd-modules-load.service: Main process exited, code=exited, status=1/FAILURE
Aug 15 16:11:02 raspberrypi systemd[1]: systemd-modules-load.service: Failed with result 'exit-code'.
Aug 15 16:11:02 raspberrypi systemd[1]: Failed to start Load Kernel Modules.
```

**Update:** I searched for the missing modules and found they are unrelated and specified in `/etc/modules-load.d`. I also realized the recently updated kernel modules were version **5.15.56**, while the system was still at the previous version I mentioned earlier. Based on [this question][1], I reinstalled the kernel updates using `apt-get` (rather than the lxpanel updater) and rebooted, resolving the problems.

Takeaway
========
As mentioned earlier, the lxpanel Updater applet somehow only updates the kernel modules without changing the system release. Why is this? What is the backend to the Updater, and should it be used for kernel updates?

  [1]: https://raspberrypi.stackexchange.com/questions/83329/linux-modules-mismatch-version