Only switching layouts left ctrl to first layout, right ctrl to last layout does not work for me?

Question

linux

There is the latest version of CentOS 7, gnome 3.28, kernel 5.6.3-1.el7.elrepo.x86_64.

Now switching works on CapsLock.

Tried all available options in gnome-tweaks, nothing works.

Any attempts to bind Russian and English to different keys do nothing.
For example, Caps - eng, Shift-Caps - rus - does not work
The option "left ctrl to first layout, right ctrl to last layout" - disables Ctrl from keyboard shortcuts. But the switch still doesn't work.

Is there a way to have a different switching method for each language?

Answer 1

try with XNeur or with gXNeur gui,
there are options to assign a layout for each language installed in the system,
see /etc/xneur/xneurrc or ~/.xneur/xneurrc
AddBind EnableLayout1
AddBind EnableLayout2
etc.
PS
and what does not suit the change in caps?

Answer 2

Thanks for the advice.
Caps is inconvenient because you need to check the current language every time.
XNeur failed to install/run on CentOS 7 and Ubuntu 20.04.
----------
Added:
Found 2 solutions to bind to literal key combinations ctrl-letter or alt-letter (CentOS 7 + Gnome 3 and Ubuntu 20.04):
1) new way with Gnome
Bind these commands to
English keyboard
shortcuts gdbus call --session --dest org.gnome.Shell --object-path /org/gnome/Shell --method org.gnome.Shell.Eval "imports.ui.status.keyboard.getInputSourceManager() .inputSources[0].activate()"
in Russian
gdbus call --session --dest org.gnome.Shell --object-path /org/gnome/Shell --method org.gnome.Shell.Eval "imports.ui.status.keyboard.getInputSourceManager().inputSources[1 ].activate()"
Source:
https://unix.stackexchange.com/questions/316998/ho...
2) legacy method (layout indicator doesn't work and doesn't work when desktop is locked)
# Set the layout to US English
ibus engine xkb:us::eng
# Set the layout to Russian
ibus engine xkb:ru::rus
This is done in settings - devices - keyboard.
PS
There are various patches for triggering ctrl-shift in the discussion here: https://bugs.launchpad.net/ubuntu/+source/gnome-co...