Preparing to unpack .../apt_1.3~rc3ubuntu2_amd64.deb ...
Unpacking apt (1.3~rc3ubuntu2) over (1.3~exp1) ...
dpkg: error processing archive /var/cache/apt/archives/apt_1.3~rc3ubuntu2_amd64.deb (--unpack):
 trying to overwrite '/usr/lib/apt/solvers/dump', which is also in package apt-utils 1.3~exp1
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Processing triggers for libc-bin (2.24-0ubuntu1) ...
Errors were encountered while processing:
 /var/cache/apt/archives/apt_1.3~rc3ubuntu2_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)