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This happened to me too. I had to grab the box that comes up and resize it like I would with a normal window, mine glitched a lot when I tried it, try resizing it as far as you can, it will try and glitch back, but just keep fighting it until it becomes a usable size, then log out of Plasma and log back in, and then you can size it back down to a normal size. Hopefully there will be an official fix for this soon
WARNING: doing this will absolutely DESTROY YOUR SYSTEM, PERMANENTLY!!!
But if you wish to continue, you can erase all the EFI variables using the rm utility, I dont think you will be able to completely zero out the chip on the system from inside of Linux as its read-only.
But to delete all the EFI variables, cd into
/sys/firmware/efi/efivars
, if this directory is not availiable, either the efivarfs is not mounted, or you are booted in legacy BIOS mode. But once you are in this directory, runchattr -i ./*
as root or sudo to remove the immutable bit on all the files, then runrm ./*
as root. This WILL break your system. Only do this if you know how to restore your system using like a chip programmer.