The installation script broke my layouts about bigbagkbdtrixxkb

[carbon-starlight]

Update: I replaced xkb folder with a backup the script created, rebooted because old layout names didn't go away and now I no longer can boot up the system: It's just a black screen with an underscore at upper left corner after selecting any option with GRUB.

[carbon-starlight]

I replaced the file again with one from my another operating system installation via tty. See no further issues.

[DreymaR]

Oh dear. Yes, messing around too much with XKB can be surprisingly dangerous it turns out. Glad you solved your issue.

As for the original issue, I'm not sure I get it completely. But you should study how the BigBag implements its components as various xkb settings. Sometimes you can have conflicts with other settings management. And sometimes you'll need a script to set and unset your whole setup, as it's not done solely by the layout component but also by model and options.