(Qt 5.4.1) This application failed to start because it could not find or load the Qt platform plugin “xcb”

Question

I reinstalled my ubuntu 14.04 and Qt 5.4.1 and Qtcreator.

Qt 5.4.1 was built from source with \"-opensource -nomake-test -nomake-example\" configure options.

Answer 1

I just stuck into a very similar issue for hours, also nothing is "not found" in ldd results on related executable, or libqxcb.so. finally I found it's the issue with the executable itself but not Qt. Tried QT_QPA_PLATFORM='' executable and it works :)