I was trying to upgrade freecad form 0.17 to 0.18 and I ran into a problem.
I first did sudo apt-get update followed by sudo apt-get dist-upgrade and it gave an error.

Preparing to unpack .../libocct-foundation-7.3_7.3.0+dfsg1-5~ubuntu16.04.2_amd64.deb ...
Unpacking libocct-foundation-7.3:amd64 (7.3.0+dfsg1-5~ubuntu16.04.2) ...
dpkg: error processing archive /var/cache/apt/archives/libocct-foundation-7.3_7.3.0+dfsg1-5~ubuntu16.04.2_amd64.deb (--unpack):
trying to overwrite '/usr/lib/x86_64-linux-gnu/libTKMath.so.7', which is also in package libocct-foundation-7.2:amd64 7.2.0-0ppa6~ubuntu16.04.1
Preparing to unpack .../libocct-modeling-data-7.3_7.3.0+dfsg1-5~ubuntu16.04.2_amd64.deb ...
Unpacking libocct-modeling-data-7.3:amd64 (7.3.0+dfsg1-5~ubuntu16.04.2) ...
dpkg: error processing archive /var/cache/apt/archives/libocct-modeling-data-7.3_7.3.0+dfsg1-5~ubuntu16.04.2_amd64.deb (--unpack):
trying to overwrite '/usr/lib/x86_64-linux-gnu/libTKGeomBase.so.7', which is also in package libocct-modeling-data-7.2:amd64 7.2.0-0ppa6~ubuntu16.04.1
Preparing to unpack .../libocct-modeling-algorithms-7.3_7.3.0+dfsg1-5~ubuntu16.04.2_amd64.deb ...
Unpacking libocct-modeling-algorithms-7.3:amd64 (7.3.0+dfsg1-5~ubuntu16.04.2) ...
dpkg: error processing archive /var/cache/apt/archives/libocct-modeling-algorithms-7.3_7.3.0+dfsg1-5~ubuntu16.04.2_amd64.deb (--unpack):
trying to overwrite '/usr/lib/x86_64-linux-gnu/libTKMesh.so.7', which is also in package libocct-modeling-algorithms-7.2:amd64 7.2.0-0ppa6~ubuntu16.04.1
Preparing to unpack .../libocct-visualization-7.3_7.3.0+dfsg1-5~ubuntu16.04.2_amd64.deb ...
Unpacking libocct-visualization-7.3:amd64 (7.3.0+dfsg1-5~ubuntu16.04.2) ...
dpkg: error processing archive /var/cache/apt/archives/libocct-visualization-7.3_7.3.0+dfsg1-5~ubuntu16.04.2_amd64.deb (--unpack):
trying to overwrite '/usr/lib/x86_64-linux-gnu/libTKService.so.7', which is also in package libocct-visualization-7.2:amd64 7.2.0-0ppa6~ubuntu16.04.1
No apport report written because MaxReports is reached already
Preparing to unpack .../libocct-ocaf-7.3_7.3.0+dfsg1-5~ubuntu16.04.2_amd64.deb ...
Unpacking libocct-ocaf-7.3:amd64 (7.3.0+dfsg1-5~ubuntu16.04.2) ...
dpkg: error processing archive /var/cache/apt/archives/libocct-ocaf-7.3_7.3.0+dfsg1-5~ubuntu16.04.2_amd64.deb (--unpack):
trying to overwrite '/usr/lib/x86_64-linux-gnu/libTKCDF.so.7', which is also in package libocct-ocaf-7.2:amd64 7.2.0-0ppa6~ubuntu16.04.1
No apport report written because MaxReports is reached already
Preparing to unpack .../libocct-data-exchange-7.3_7.3.0+dfsg1-5~ubuntu16.04.2_amd64.deb ...
Unpacking libocct-data-exchange-7.3:amd64 (7.3.0+dfsg1-5~ubuntu16.04.2) ...
dpkg: error processing archive /var/cache/apt/archives/libocct-data-exchange-7.3_7.3.0+dfsg1-5~ubuntu16.04.2_amd64.deb (--unpack):
trying to overwrite '/usr/lib/x86_64-linux-gnu/libTKSTEP209.so.7', which is also in package libocct-data-exchange-7.2:amd64 7.2.0-0ppa6~ubuntu16.04.1
No apport report written because MaxReports is reached already
Processing triggers for libc-bin (2.23-0ubuntu11) ...
Errors were encountered while processing:
/var/cache/apt/archives/libocct-foundation-7.3_7.3.0+dfsg1-5~ubuntu16.04.2_amd64.deb
/var/cache/apt/archives/libocct-modeling-data-7.3_7.3.0+dfsg1-5~ubuntu16.04.2_amd64.deb
/var/cache/apt/archives/libocct-modeling-algorithms-7.3_7.3.0+dfsg1-5~ubuntu16.04.2_amd64.deb
/var/cache/apt/archives/libocct-visualization-7.3_7.3.0+dfsg1-5~ubuntu16.04.2_amd64.deb
/var/cache/apt/archives/libocct-ocaf-7.3_7.3.0+dfsg1-5~ubuntu16.04.2_amd64.deb
/var/cache/apt/archives/libocct-data-exchange-7.3_7.3.0+dfsg1-5~ubuntu16.04.2_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
tj@laptop:~$ sudo apt-get autoremove
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these.
The following packages have unmet dependencies:
libfreecad-python2-0.18 : Depends: libocct-data-exchange-7.3 but it is not installed
Depends: libocct-foundation-7.3 but it is not installed
Depends: libocct-modeling-algorithms-7.3 but it is not installed
Depends: libocct-modeling-data-7.3 but it is not installed
Depends: libocct-ocaf-7.3 but it is not installed
Depends: libocct-visualization-7.3 but it is not installed
E: Unmet dependencies. Try using -f.

Now I cannot get freecad to install and run.

tj

Please paste the output from the following command within CODE tags (see https://www.linuxquestions.org/quest...og.php?b=36313) so that we can determine which of your packages are not properly installed:

Also, please paste the output from the following command (also within CODE tags) so that we can have a look at your software sources.

If you don't have inxi installed and are unable to install it, please instead paste the output from: