A few moments ago I wanted to shut down my laptop and got the standard question whether I would like to install updates in the process. I checked the box and was very surprised to see my ThinkPad reboot into a black screen only saying "Please wait while we install a system update" and a rotating /.
After a while, my laptop shutdown and I could reboot normally. But what happened and what was this message about?
EDIT:
Before running into this issue, I loaded a firmware update via Gnome Software and have not previously shutdown the computer. Was the "weird" update process result of this firmware update?