Can’t log in after changing SDDM

After changing the SDDM theme I can’t log in. I think it’s because the new SDDM forces the first letter in the username to be capital or it might just be an purely visual thing

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Provide Information:

If all you did was to change your sddm theme:
since you cannot revert your changes in the Gui, because you cannot log in
you can switch to a TTY
and change /etc/sddm.conf.d/kde_settings.conf
in the [Theme] section
set the theme back to the original (breeze):

instead of whatever is there currently, what you set it to

use an editor like nano to do it
sudo nano /etc/sddm.conf.d/kde_settings.conf

then either reboot
or restart the display manager
systemctl restart sddm

Having a console filemanager installed
one that will work in TTY as well as in terminal
will help with the process of working at the command line

install mc
pamac install mc

You can use it to do the edit
when started via sudo
sudo mc
but be careful when operating it as root!

Also, perhaps the easiest way:
if you can access your installation from the outside
(boot from the installation live usb, for example - which you might even be using right now to write this …)
then you can use that to make the change,
this time from the fully working graphical environment of the live usb …

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