Bug 178105

Works fine here with us and gr layouts.

Could you please try switching layouts without kxkb, e.g. run the command:
setxkbmap us,hu -option grp:ctrl_shift_toggle
and then try to switch with Ctrl+Shift

(In reply to comment #2)
> Could you please try switching layouts without kxkb, e.g. run the command:
> setxkbmap us,hu -option grp:ctrl_shift_toggle
> and then try to switch with Ctrl+Shift
> 

Hi,

I run the command, then nothing happened. After this, I tried the same from Konsole, I got: 
szabolcs@molni-002:~$ setxkbmap us,hu -option grp:ctrl_shift_toggle
Error loading new keyboard description

Maybe a package is missing then? I'm confused since I don't get any error message when configuring from the gui, but I get this when trying setxkbmap

check if you have all the layout files, you us and hu must be present somewhere e.g. in /usr/share/X11/xkb/symbols/
if the us and hu files are there you may try to add '-verbose 10' option to the setxkbmap 
also you may want to check the 'setxkbmap' command in the kxkb configuration and try to run that one.

any luck with this problem?

Ohm sorry, but I had no time lately :(

So:

I have the symbol files:
szabolcs@molni-002:/usr/share/X11/xkb/symbols$ ls
ad      bg        compose       eurosign      group    is      latam           me        no    se         tj
af      br        ctrl          fi            hp_vndr  it      latin           mk        np    sgi_vndr   tr
al      braille   cz            fo            hr       jp      level3          mm        olpc  shift      ua
altwin  bt        de            fr            hu       keypad  level5          mn        pc    si         us
am      by        digital_vndr  fujitsu_vndr  ie       kg      lk              mt        pk    sk         uz
ara     ca        dk            gb            il       kh      lt              mv        pl    sony_vndr  vn
az      capslock  ee            ge            in       kpdl    lv              nbsp      pt    srvr_ctrl  xfree68_vndr
ba      cd        epo           gh            inet     kr      ma              nec_vndr  ro    sun_vndr   za
bd      ch        es            gn            iq       kz      macintosh_vndr  ng        rs    sy
be      cn        et            gr            ir       la      mao             nl        ru    th
szabolcs@molni-002:/usr/share/X11/xkb/symbols$

And I get the following when setting -verbose to 10:

szabolcs@molni-002:/usr/share/X11/xkb/symbols$ setxkbmap us,hu -option grp:ctrl_shift_toggle -verbose 10
Setting verbose level to 10
locale is C
Warning! Multiple definitions of keyboard layout
         Using command line, ignoring X server
Applied rules from evdev:
model:      pc105
layout:     us,hu
options:    grp:ctrl_shift_toggle
Trying to build keymap using the following components:
keycodes:   evdev+aliases(qwerty)
types:      complete
compat:     complete
symbols:    pc+us+hu:2+inet(evdev)+group(ctrl_shift_toggle)
geometry:   pc(pc105)
Error loading new keyboard description
szabolcs@molni-002:/usr/share/X11/xkb/symbols$

Actually I have no idea yet :)

well, the problem seems to be outside of kxkb, so I'd suggest reinstalling:
1) files of xkb information (in /usr/share/X11/xkb)
2) setxkbmap itself
I think in Ubuntu you can find the corresponding packages with apt-cache command

Does not look like kxkb problem - closing.