It seems I got a valid backtrace. I installed xserver-xorg-core-
hwe-18.04-dbgsym and it was possible to get a backtrace with more data.
Here is it:

(gdb) bt f
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
        set = {__val = {171516928, 0, 0, 0, 0, 94568085079104, 94568054863600, 
67108868, 140083657316496, 0, 94568084835824, 94568085157664, 94568085157664, 
94568085534016, 0, 0}}
        pid = <optimized out>
        tid = <optimized out>
        ret = <optimized out>
#1  0x00007f67c465e801 in __GI_abort () at abort.c:79
        save_stage = 1
        act = {__sigaction_handler = {sa_handler = 0x5602591f7720, sa_sigaction 
= 0x5602591f7720}, sa_mask = {__val = {94568085534016, 0 <repeats 11 times>, 
67108868, 140083657316496, 5467293301926151424, 0}}, sa_flags = 1465188592, 
sa_restorer = 0x7ffc2f5ddeb0}
        sigs = {__val = {32, 0 <repeats 15 times>}}
        __cnt = <optimized out>
        __set = <optimized out>
        __cnt = <optimized out>
        __set = <optimized out>
#2  0x00005602575166da in OsAbort () at ../../../../os/utils.c:1351
No locals.
#3  0x000056025751c273 in AbortServer () at ../../../../os/log.c:879
No locals.
#4  0x000056025751d095 in FatalError (f=f@entry=0x5602575500f0 "Caught signal 
%d (%s). Server aborting\n") at ../../../../os/log.c:1017
        args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 
0x7ffc2f5ddfa0, reg_save_area = 0x7ffc2f5dded0}}
        args2 = {{gp_offset = 8, fp_offset = 48, overflow_arg_area = 
0x7ffc2f5ddfa0, reg_save_area = 0x7ffc2f5dded0}}
        beenhere = 1
#5  0x0000560257513773 in OsSigHandler (signo=11, sip=<optimized out>, 
unused=<optimized out>) at ../../../../os/osinit.c:156
        unused = <optimized out>
        sip = <optimized out>
        signo = 11
#6  <signal handler called>
No locals.
#7  _XkbSetMapChecks (client=client@entry=0x560259cd7c40, 
req=req@entry=0x56025a1b4dd0, values=values@entry=0x56025a1b4df4 "", 
dev=<optimized out>) at ../../../../xkb/xkb.c:2387
        xkbi = <error reading variable xkbi (Não é possível acessar a memória 
no endereço 0x68)>
        xkb = <optimized out>
        error = <optimized out>
        nTypes = 0
        nActions = <optimized out>
        mapWidths = '\000' <repete 255 vezes>
        symsPerKey = {0 <repeats 256 times>}
        map = <optimized out>
        i = <optimized out>
#8  0x00005602574b734f in ProcXkbSetMap (client=0x560259cd7c40) at 
../../../../xkb/xkb.c:2655
        other = 0x560258ea7d40
        dev = 0x560258ea84d0
        tmp = 0x56025a1b4df4 ""
        rc = 0
        stuff = <optimized out>
        master = 0x560258ea84d0
#9  0x00005602573b64e8 in Dispatch () at ../../../../dix/dispatch.c:478
        result = <optimized out>
        client = <optimized out>
        start_tick = 1390
#10 0x00005602573ba4e8 in dix_main (argc=11, argv=0x7ffc2f5de988, 
envp=<optimized out>) at ../../../../dix/main.c:276
        i = <optimized out>
        alwaysCheckForInput = {0, 1}
#11 0x00007f67c463fb97 in __libc_start_main (main=0x5602573a4150 <main>, 
argc=11, argv=0x7ffc2f5de988, init=<optimized out>, fini=<optimized out>, 
rtld_fini=<optimized out>, stack_end=0x7ffc2f5de978) at ../csu/libc-start.c:310
        self = <optimized out>
        __self = <optimized out>
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -957471381706168478, 
94568053358944, 140721103169920, 0, 0, -6824483104159357086, 
-6882266889145079966}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 
0x7f67c7364733 <_dl_init+259>, 0x7f67c7352438}, data = {prev = 0x0, cleanup = 
0x0, canceltype = -952744141}}}
        not_first_call = <optimized out>
#12 0x00005602573a418a in _start ()
No symbol table info available.

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https://bugs.launchpad.net/bugs/1841190

Title:
  Xorg crashes when trying to insert letter with accent using Onboard

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