apt - I have a version dependency that I don't understand

Nautilus threw a SEGFAULT, the Ubuntu bug handler caught the crash and generated a crash report. So far, so good. In the bug report, it said that there some packages that were out of date. Okay, I'd like to update them. However, updating one package, , causes a bunch of other packages dependency problems.

$ sudo apt-get upgrade apt cpp-5 apt-utils dosfstools gcc-5-base init-system-helpers libapt-inst2.0 libapt-pkg5.0   libgd3 libstdc++6
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
 g++-5 : Depends: gcc-5-base (= 5.3.1-14ubuntu2) but 5.3.1-14ubuntu2.1 is to be installed
 gcc-5 : Depends: cpp-5 (= 5.3.1-14ubuntu2) but 5.3.1-14ubuntu2.1 is to be installed
         Depends: gcc-5-base (= 5.3.1-14ubuntu2) but 5.3.1-14ubuntu2.1 is to be installed
 lib32stdc++6 : Depends: gcc-5-base (= 5.3.1-14ubuntu2) but 5.3.1-14ubuntu2.1 is to be installed
 libasan2 : Depends: gcc-5-base (= 5.3.1-14ubuntu2) but 5.3.1-14ubuntu2.1 is to be installed
 libatomic1 : Depends: gcc-5-base (= 5.3.1-14ubuntu2) but 5.3.1-14ubuntu2.1 is to be installed
 libcc1-0 : Depends: gcc-5-base (= 5.3.1-14ubuntu2) but 5.3.1-14ubuntu2.1 is to be installed
 libcilkrts5 : Depends: gcc-5-base (= 5.3.1-14ubuntu2) but 5.3.1-14ubuntu2.1 is to be installed
 libgcc-5-dev : Depends: gcc-5-base (= 5.3.1-14ubuntu2) but 5.3.1-14ubuntu2.1 is to be installed
 libgfortran3 : Depends: gcc-5-base (= 5.3.1-14ubuntu2) but 5.3.1-14ubuntu2.1 is to be installed
 libgomp1 : Depends: gcc-5-base (= 5.3.1-14ubuntu2) but 5.3.1-14ubuntu2.1 is to be installed
 libitm1 : Depends: gcc-5-base (= 5.3.1-14ubuntu2) but 5.3.1-14ubuntu2.1 is to be installed
 liblsan0 : Depends: gcc-5-base (= 5.3.1-14ubuntu2) but 5.3.1-14ubuntu2.1 is to be installed
 libmpx0 : Depends: gcc-5-base (= 5.3.1-14ubuntu2) but 5.3.1-14ubuntu2.1 is to be installed
 libquadmath0 : Depends: gcc-5-base (= 5.3.1-14ubuntu2) but 5.3.1-14ubuntu2.1 is to be installed
 libstdc++-5-dev : Depends: gcc-5-base (= 5.3.1-14ubuntu2) but 5.3.1-14ubuntu2.1 is to be installed
 libtsan0 : Depends: gcc-5-base (= 5.3.1-14ubuntu2) but 5.3.1-14ubuntu2.1 is to be installed
 libubsan0 : Depends: gcc-5-base (= 5.3.1-14ubuntu2) but 5.3.1-14ubuntu2.1 is to be installed
E: Broken packages
$

Is there a way to resolve this issue? I looked at this post and I am not sure I like that: I assume that those dependencies are there for a reason. This one suggests some additional troubleshooting. Not sure if that is appropriate here, but better to give you information you don't need than not give you the information you do.

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04 LTS
Release:    16.04
Codename:   xenial
$
$ grep -e '^deb\s' /etc/apt/sources.list /etc/apt/sources.list.d/*.list
/etc/apt/sources.list:deb [us.archive.ubuntu.com](http://us.archive.ubuntu.com/ubuntu/) xenial main restricted
/etc/apt/sources.list:deb [us.archive.ubuntu.com](http://us.archive.ubuntu.com/ubuntu/) xenial-updates main restricted
/etc/apt/sources.list:deb [us.archive.ubuntu.com](http://us.archive.ubuntu.com/ubuntu/) xenial universe
/etc/apt/sources.list:deb [us.archive.ubuntu.com](http://us.archive.ubuntu.com/ubuntu/) xenial-updates universe
/etc/apt/sources.list:deb [us.archive.ubuntu.com](http://us.archive.ubuntu.com/ubuntu/) xenial multiverse
/etc/apt/sources.list:deb [us.archive.ubuntu.com](http://us.archive.ubuntu.com/ubuntu/) xenial-updates multiverse
/etc/apt/sources.list:deb [us.archive.ubuntu.com](http://us.archive.ubuntu.com/ubuntu/) xenial-backports main restricted universe multiverse
/etc/apt/sources.list:deb [us.archive.ubuntu.com](http://security.ubuntu.com/ubuntu) xenial-security main restricted
/etc/apt/sources.list:deb [us.archive.ubuntu.com](http://security.ubuntu.com/ubuntu) xenial-security universe
/etc/apt/sources.list:deb http://security.ubuntu.com/ubuntu) xenial-security multiverse
/etc/apt/sources.list.d/embrosyn-ubuntu-cinnamon-xenial.list:deb [us.archive.ubuntu.com](http://ppa.launchpad.net/embrosyn/cinnamon/ubuntu) xenial main
/etc/apt/sources.list.d/google-chrome.list:deb [arch=amd64] [us.archive.ubuntu.com](http://dl.google.com/linux/chrome/deb/) stable main
/etc/apt/sources.list.d/google-webdesigner.list:deb [us.archive.ubuntu.com](http://dl.google.com/linux/webdesigner/deb/) stable main
$

I think this issue is not important, because Nautilus mostly works, and I was not aware of the problem until the crash reporter reported the crash. Also, I'm not developing in C or C++.

Thank you for your kind assistance.