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Run installation media and copy systemD over to the system
For real though, if you break ANYTHING in Linux, it can probably be repaired through live image on your flash drive.
I use BTRFS, and it randomly decided to corrupt like half of the system packages on my system after an update, but all I had to do to fix it was boot into a live environment and run a command to reinstall everything on my system. :P
Its been pretty stable for me
Same 7 years with no issues
Using btrfs for past 6 months in my kde environment, doesn't encountered any problem like this. Pretty stable
It's only really a problem if I try upgrading while low on space and also having disk compression enabled
No probably about it
Or just use the recovery shell. They did say they could log in.
Is it possible to chroot from a livedisk and reinstall systemd from that? I'd imagine the Internet connection would work just fine.