I have finally gotten round to updating my rolling release installation after a long delay.

One of the final cycles in this catch-up [1] pulled in an upgrade from Plasma 5 to Plasma 6

Some things stopped working for me after that and I want to share with you what and how I solved them.

1. Graphical environment doesn't start because video driver is not loaded (dkms)

I have a GTX 750 and even though dkms does a successful compilation and installation, this driver no longer automatically loads during startup.

There may be other, better solutions, but what I did is [I'm using sddm] is:

systemctl edit --full sddm

in the section [Service] add an entry ExecStartPre=/usr/bin/modprobe nvidia-drm

save and quit

then reboot

2. no RDP in krcd

-> install freerdp2

3. Fish works in kwrite and kate, etc, but not in develop

-> install kio5_extras

[1] https://wiki.archlinux.org/title/Arch_Linux_Archive#How_to_restore_all_packages_to_a_specific_date