Ubuntu apt

Workaround 1:

1. Go to Application Launcher (Start Menu) -> Applications -> Settings -> Set Keyboard Input Method. Then, a message will come up: 'Current configuration for the input...

This

rename 's/.list$/.list.disable/' /etc/apt/sources.list.d/*.list

renamed all files in /etc/apt/sources.list.d/ from *.list to...

First I freshly added the ppa and reinstalled php7.1

sudo apt-add-repository ppa:ondrej/php
sudo apt-get update
sudo apt install php7.1

Than I installed...

Add to /var/lib/tftpboot/ltsp/i386/lts.conf:

XKBLAYOUT="de,us"

XKBOPTIONS="grp:alt_shift_toggle"

To switch between...

This may work -- I recently helped my neighbor with a similar problem. Although this could be a software issue, it may indeed be a hardware solution that solves your problem. Look for a switch...