If somebody is having errors while trying to start doplhin like: unable to create io-slave: klauncher said: Error while loading '/usr/lib/qt/plugins/kf5/kio/file.so' or similar, try to start dolphin with
dbus-launch dolphin
and it works.
Konqueror is working fine. It seems dbus isn’t starting a session for the user/process.
A reboot is often necessary when the kernel gets updated.
Since almost all of the supported kernels received updates this time, everyone will need to reboot.
I updated the announcement to include the instruction to reboot.
I was getting the same dolphin error, but I rebooted (as I got into the habit of doing after updates, since various things usually go crazy), dolphin then worked fine.
Cheers!