gnome переключение раскладки

I've sort of solved it:

system settings -> keyboard -> shortcuts

1. set "switch to next source" to disabled .
2. set "switch to previous source" to disabled

in dconf editor go to org->gnome->desktop->input-sources
1. set the xkb options to

['grp:alt_shift_toggle']

The problem with this solution is that the language indicator in the taskbar is not changed when you change the keyboard layout, but that doesn't really bother me.

https://bbs.archlinux.org/viewtopic.php?id=152127