Thanks to @fernandomaroto who kindly informed me to post a new topic.
So, as I tried to tell in issue “Error in installing latest updates! please need help”, the UI my antergos PC won’t start after the login. I had already experienced the issue of not being able to update the ca-certificates package. I updated many other packages by just deselecting the two certificate packages.
Then yesterday I bumped into the mentioned issue and the advice in the posts in that thread. So executed the command “pacman -Syu --force”. Everything looked good. Then I rebooted, but after login, the screen remained black. However, I could open a virtual terminal and try other updates and tricks. I have mainly used Fedora earlier and Antergos is so much different…
My login manager is “lightdm”. I tried to use gdm according to some posts in this forum, but that didn’t work at all better. Desktop manager is anyway Gnome.
I have had difficulties earlier also with Antergos updates, but not as drastic as this certificate update.
Any help is greatly appreciated!