No keyboard input in Qt Creator after update to Qt5

~]$ /usr/local/bin/xca

xkbcommon: ERROR: failed to add default include path /usr/share/X11/xkb Qt: Failed to create XKB context! Use QT_XKB_CONFIG_ROOT environmental variable to provide an additional search path, add ':' as separator to provide several search paths and/or make sure that XKB configuration data directory contains recent enough contents, to update please see http://cgit.freedesktop.org/xkeyboard-config/ .

sudo apt-get install xkb-data (xkeyboard-config)

has solved my problem (no input from keyboard)

It is apparently a known bug, some messages and posts talks about this issue on the Internet.

Maybe try this, from https://lists.debian.org/debian-backports/2014/10/msg00061.html

Opening Qt5 applications from backports (or self compiled against backported Qt5) have some trouble finding XCB data:

$ /usr/lib/x86_64-linux-gnu/qt5/examples/quick/d ialogs/systemdialogs/systemdialogs xkbcommon: ERROR: failed to add default include path auto Qt: Failed to create XKB context! Use QT_XKB_CONFIG_ROOT environmental variable to provide an additional search path, add ':' as separator to provide several search paths and/or make sure that XKB configuration data directory contains recent enough contents, to update please see http://cgit.freedesktop.org/xkeyboard-config/ .

Applications run fine, but can't get input from the keyboard.

As the warning points out, setting the environment variable fixes it:

export QT_XKB_CONFIG_ROOT=/usr/share/X11/xkb

So, try to run qtcreator with the folowing command:

export QT_XKB_CONFIG_ROOT=/usr/share/X11/xkb && qtcreator