Do dist-upgrade

ubuntu/18.04-amd64/Dockerfile

@@ -7,6 +7,7 @@ RUN apt-get install curl -y
 RUN echo "deb http://archive.neon.kde.org/user bionic main" > /etc/apt/sources.list.d/neon.list
 RUN curl https://origin.archive.neon.kde.org/public.key -sS | apt-key add -
 RUN apt-get update
+RUN apt-get dist-upgrade -y
 
 # install toolchain
 RUN apt-get install -y g++ cmake git gettext checkinstall proot