great, now upgrade your system (optional) "apt-get upgrade -y && apt-get dist-upgrade -y" and reboot, enter "setxkbmap se" in you terminal, now your problem should be solved.

ok eneter:
apt-get install xserver-xorg-input-all xserver-xorg-input-kbd xsettingsd xterm xtermcontrol xtermset xutils xutils-dev xview-clients xxkb
(welcome to the linux world where nothing is simple!!)

ok in your terminal enter (without "" ):
"sudo apt-get update && sudo apt-get install xserver-xorg xserver-xorg-core xserver-xorg-dev xserver-xorg-input-acecad xserver-xorg-input-aiptek xserver-xorg-input-all xserver-xorg-input-evdev xserver-xorg-input-kbd xserver-xorg-input-mouse xserver-xorg-input-mtrack xserver-xorg-input-multitouch xserver-xorg-input-void xserver-xorg-video-all xsettingsd xterm xtermcontrol xtermset xutils xutils-dev xview-clients xxkb"
This should install xorg with all of it's cool stuff and will solve your problem (the las one xxkb is the most important becos it would solve XKB extension not present)
Reminder: you should have a good internet connection.
   

now i knew the problem. tell me what distro are you using to fix it

it should work!
try entering "setxkbmap se" in you terminal 'without "" '

ok open your lxterminal, edit, preferences, advanced, Select-By-Word characters: copy and paste what's in that case for me
 

i can walk you through to solve you issue

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