See Bug #1505164:
# apt-get install libapache2-mod-wsgi-py3 The following packages have unmet dependencies: libapache2-mod-wsgi-py3 : Depends: libpython3.4 (>= 3.4~b1) but it is not going to be installed E: Unable to correct problems, you have held broken packages.
See Bug #1505164:
# apt-get install libapache2- mod-wsgi- py3 mod-wsgi- py3 : Depends: libpython3.4 (>= 3.4~b1) but it is not going to be installed
The following packages have unmet dependencies:
libapache2-
E: Unable to correct problems, you have held broken packages.