Isso é um erro: link
Há uma discussão sobre como lidar temporária ou permanentemente com o apparmor (agora parte do kubuntu) e a falta de perfis no libreoffice.
Eu ainda estou lutando com isso, mas isso deve apontar você na direção certa.
Feb 22 11:00:47 kid kernel: [ 880.852002] audit: type=1400 audit(1519293647.360:525): apparmor="DENIED" operation="open" profile="libreoffice-soffice" name="/home/torsten/.kde/share/config/kdeglobals" pid=3552 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000
Feb 22 11:00:47 kid kernel: [ 880.853905] audit: type=1400 audit(1519293647.362:526): apparmor="DENIED" operation="open" profile="libreoffice-soffice" name="/etc/kde4rc" pid=3552 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Feb 22 11:00:47 kid kernel: [ 880.853945] audit: type=1400 audit(1519293647.362:527): apparmor="DENIED" operation="open" profile="libreoffice-soffice" name="/home/torsten/.kde/share/config/kdeglobals" pid=3552 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000
Feb 22 11:00:47 kid kernel: [ 880.856826] audit: type=1400 audit(1519293647.365:528): apparmor="DENIED" operation="exec" profile="libreoffice-soffice" name="/usr/bin/kdeinit4" pid=3564 comm="soffice.bin" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0
Feb 22 11:00:47 kid kernel: [ 880.859263] audit: type=1400 audit(1519293647.368:529): apparmor="DENIED" operation="open" profile="libreoffice-soffice" name="/home/torsten/.config/Trolltech.conf" pid=3552 comm="soffice.bin" requested_mask="wrc" denied_mask="wrc" fsuid=1000 ouid=1000
Feb 22 11:00:47 kid kernel: [ 880.859273] audit: type=1400 audit(1519293647.368:530): apparmor="DENIED" operation="open" profile="libreoffice-soffice" name="/home/torsten/.config/Trolltech.conf" pid=3552 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000
Feb 22 11:00:47 kid kernel: [ 880.859644] audit: type=1400 audit(1519293647.368:531): apparmor="DENIED" operation="file_mmap" profile="libreoffice-soffice" name="/usr/lib/kde4/kfilemodule.so" pid=3552 comm="soffice.bin" requested_mask="m" denied_mask="m" fsuid=1000 ouid=0
Feb 22 11:00:47 kid kernel: [ 880.859847] audit: type=1400 audit(1519293647.368:532): apparmor="DENIED" operation="file_mmap" profile="libreoffice-soffice" name="/usr/lib/kde4/kfilemodule.so" pid=3552 comm="soffice.bin" requested_mask="m" denied_mask="m" fsuid=1000 ouid=0
Feb 22 11:00:47 kid kernel: [ 880.873476] audit: type=1400 audit(1519293647.382:533): apparmor="DENIED" operation="open" profile="libreoffice-soffice" name="/home/torsten/.config/Trolltech.conf" pid=3552 comm="soffice.bin" requested_mask="wrc" denied_mask="wrc" fsuid=1000 ouid=1000
Feb 22 11:00:54 kid kernel: [ 887.608315] kauditd_printk_skb: 84 callbacks suppressed
Feb 22 11:00:54 kid kernel: [ 887.608317] audit: type=1400 audit(1519293654.117:618): apparmor="DENIED" operation="open" profile="libreoffice-soffice" name="/home/torsten/.kde/share/config/kdebugrc" pid=3567 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000
Isso é um erro: link
Há uma discussão sobre como lidar temporária ou permanentemente com o apparmor (agora parte do kubuntu) e a falta de perfis no libreoffice.
Eu ainda estou lutando com isso, mas isso deve apontar você na direção certa.