qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found

Question

I'm getting

 qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.

after a fresh installation of qt creator in Debian 9. Unfortunately, the solutions here tell me to do ldd /usr/lib/qt/plugins/platforms/libqxcb.so but /usr/lib/qt/ doesn't even exist.

Answer 1

sudo apt-get install --reinstall libxcb-xinerama0

Answer 2

Follow this two steps, it work for me with wireshark

$ sudo -s
# sudo apt-get install libcap2-bin

and reboot for more ...