After I installed PureOS 9 for the 4th time, but this time without encrypted HOME partition, there were no problems after the update of packages and I didn't receive any warnings of wrong keyboard layout so far. So, the it seems that the problem appears when encryption during partitioning comes in place.

And... Here we go again... ;(

These are the last messages, after I do "apt full-upgrade"...

No, unfortunately not! I just installed the latest ISO with PureOS 9 from a USB flash drive, and it even gets worse! I mean, as long as the installation process is done, and after the reboot, 5 minutes later I get the notification there are system updates available. Whether I do these updates or I follow the instructions above and do it from the terminal with "sudo apt full-upgrade", after the next reboot I get the same error from the photos I've posted here earlier.
I guess the problem is connected to these 2 facts:

1. During the setup I set up my home partition to be encrypted (LUKS) with a password.
2. There may be really a problem with my keyboard layout, but I have no damn idea why, because: I'm using Librem15v3 - so you know what type of keyboard there is and I don't change the default settings during the installation process: the system language is English "unspecified" and the keyboard layout is US. After installation, when I do the system account setting, I choose again the default US layout and US English as environment locals (although as Bulgarian, living in Bulgaria I should later install my BG environment).

But that's the situation right now, and I can reproduce is to you. In the last 2 hours, it happens already 3 times in a row... :(

I can do that, of course, but as I said already, this is happening for the 2nd time, after a new/clean installation from a USB flash drive with a PureOS8 ISO image. After installing some of the system updates, this issue appears. How can I be sure this would not happen again?

@mladen & @Erik_Leroux please help me with this issue! :(
Many thanks!

In T792#14834, @mladen wrote:

@gorgeous Did you try this procedure: https://tracker.pureos.net/w/troubleshooting/broken_upgrade/#problem-2 (solution for problem 2)?

More detailed picture with messages on the 2nd attachment.