Comment 9 for bug 1560759

I have the same problem, using Xenial 16.04 (X64).

Seems solution is to install python3-aptdaemon.pkcompat, which removes packagekit.

'sudo apt-get install python3-aptdaemon.pkcompat'

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED
  packagekit
The following NEW packages will be installed
  python3-aptdaemon.pkcompat
0 to upgrade, 1 to newly install, 1 to remove and 0 not to upgrade.
Need to get 0 B/23.1 kB of archives.
After this operation, 921 kB disk space will be freed.
Do you want to continue? [Y/n] y
dpkg: packagekit: dependency problems, but removing anyway as you requested:
 packagekit-tools depends on python3-aptdaemon.pkcompat | packagekit-system-interface | packagekit (= 0.8.17-4ubuntu6~gcc5.4ubuntu1); however:
  Package python3-aptdaemon.pkcompat is not installed.
  Package packagekit-system-interface is not installed.
  Package packagekit which provides packagekit-system-interface is to be removed.
  Package python3-aptdaemon.pkcompat which provides packagekit-system-interface is not installed.
  Package packagekit is to be removed.
 packagekit-tools depends on python3-aptdaemon.pkcompat | packagekit-system-interface | packagekit (= 0.8.17-4ubuntu6~gcc5.4ubuntu1); however:
  Package python3-aptdaemon.pkcompat is not installed.
  Package packagekit-system-interface is not installed.
  Package packagekit which provides packagekit-system-interface is to be removed.
  Package python3-aptdaemon.pkcompat which provides packagekit-system-interface is not installed.
  Package packagekit is to be removed.
 syste
(Reading database ... 429128 files and directories currently installed.)
Removing packagekit (0.8.17-4ubuntu6~gcc5.4ubuntu1) ...
Processing triggers for dbus (1.10.6-1ubuntu3) ...
Selecting previously unselected package python3-aptdaemon.pkcompat.
(Reading database ... 429095 files and directories currently installed.)
Preparing to unpack .../python3-aptdaemon.pkcompat_1.1.1+bzr982-0ubuntu14_all.deb ...
Unpacking python3-aptdaemon.pkcompat (1.1.1+bzr982-0ubuntu14) ...
Processing triggers for dbus (1.10.6-1ubuntu3) ...
Setting up python3-aptdaemon.pkcompat (1.1.1+bzr982-0ubuntu14) ...

After this, system info works fine and no more crashing.