Preparing to unpack .../libreoffice-pdfimport_1%3a5.1.4-0ubuntu1_amd64.deb ...
Unpacking libreoffice-pdfimport (1:5.1.4-0ubuntu1) over (1:5.2.0~rc4-0ubuntu1~xenial2) ...
dpkg: warning: downgrading libreoffice-gnome from 1:5.2.0~rc4-0ubuntu1~xenial2 to 1:5.1.4-0ubuntu1
Preparing to unpack .../libreoffice-gnome_1%3a5.1.4-0ubuntu1_amd64.deb ...
Unpacking libreoffice-gnome (1:5.1.4-0ubuntu1) over (1:5.2.0~rc4-0ubuntu1~xenial2) ...
dpkg: error processing archive /var/cache/apt/archives/libreoffice-gnome_1%3a5.1.4-0ubuntu1_amd64.deb (--unpack):
 trying to overwrite '/usr/lib/libreoffice/program/liblosessioninstalllo.so', which is also in package libreoffice-gtk2 1:5.2.0~rc4-0ubuntu1~xenial2