After clean system upgrade to Fedora 36 from F35, after the next update systemd suffered multiple . service fails. My system has been running for years without reinstall.
I can log in thru my password, but boot fails with no access to virtual desktops -- with or without safe mode.
Is it possible to reinstall systemd or other necessary boot requirements from Live CD without losing the rest of my system and applications already installed ? I have a number of applications that will be difficult to reinstall otherwise. Any help is appreciated. Thank you.

Before fiddling with system updates, you don't take a backup to roll back to?

most probably you need to check what went wrong, why did those services fail.

Possibly you will have a more focused and informed response if you ask the question on the 'ask fedora' forum https://ask.fedoraproject.org.

Looking at the logs with should allow you to see what errors may have been logged in the latest boot and searching for the services that failed to load there or with might give you some ideas of what went wrong.

Without some information as a starting point we would totally be guessing in any responses we may provide. We don't even have a clue as to what services may have failed, nor what kernel you are running.

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Hi thanks to all of you for your response. I had a backup of the system when I did the original upgrade, and discarded it afterward to make room It was on the net ordinary update that I lost my systemd services. I cant read the journalctl because I can't get access to any terminal virtual or otherwise. I have a LUKS password , and can get into boot through the password, and then boot stops after several systemd.service fails. I'm going to try to find a way to use a Live- CD and see if there is any way to Log In and give permissions to root on the Live CD so I can access or reinstall Systemd. If that fails I may or may not reinstall Fedora. I just experienced a similar failure with Debian, which I have installed on another drive. Debian is at least months behind Fedora, so I'm guessing there will be more problems to come. Fortunately, I also have PClos Linux installed, and it uses SysVinit -- latest version , and no problems. Thanks again, all of you for your response.
If I can get some photos of the boot sequence I'll try to post them here.