Looks like "dpkg-reconfigure locales" need some type of dialog with user.

Replace with another approach.

--HG--
branch : develop

bitbucket-pipelines.yml

@@ -15,8 +15,9 @@ pipelines:
             - apt-get update # required to install qt
             - apt-get install -y locales xvfb qtbase5-dev libqt5svg5-dev qt5-default qttools5-dev-tools libqt5xmlpatterns5-dev libqt5core5a libqt5gui5 libqt5printsupport5 libqt5svg5 libqt5widgets5 libqt5xml5 libqt5xmlpatterns5 xpdf
             - locale
+            - echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen
             - locale-gen "en_US.UTF-8"
-            - dpkg-reconfigure locales
+            - update-locale LANG=en_US.UTF-8 LC_CTYPE=en_US.UTF-8
             - mkdir build
             - cd build
             - qmake --version