This is an old problem... Works on windows,
On Ubuntu based machines all ifc files cause the system to hang on import, this goes for both files exported from freecad and from others..
Looks very similar to https://forum.freecadweb.org/viewtopic.php?f=39&t=32158

regards

Hi all Not sure if this should be posted here, but here goes: All my Linux machines are based on Ubuntu, they all give this error while importing: utfFC.png Currently I am setting up a new machine, a Dell Precision 3250. It has windows 10 pro as installed OS. I am in the process of installing Linux ...

At least to others have reported similar issue.
It looks to me like the only common denominator is various versions of Ubuntu.

Some related posts:

• https://forum.freecadweb.org/viewtopic.php?f=39&t=31163
  https://forum.freecadweb.org/viewtopic.php?f=39&t=30451

regards

Looks like Snap settings is one of the areas where new users get lost. Have been there :oops: Some of us should probably make some examples on Snapping, also examples where snap settings are contradicting one and other. It is basically simple logic, but not so easy to catch when new to fc. BTW 01 A ...

The size limit for the PPA has been increased. The experimental freecad-doc package is now also available on Ubuntu 16.04. About ifcopenshell: With extra ppa, Still hangs computer on import to freecad Believe it is related to string function and UTF8 compatibility with Python 2.7. Problem is probab...

This topic has been split off from this thread: https://forum.freecadweb.org/viewtopic.php?f=18&t=26326&p=259808#p259791 Navigating the wiki can be challenging, especially searching the wiki (I've opened an issue ( 3277 )about this due to getting many redundant translation pages as a result...

The differences I have found are:
Wire is not easily editable
Wire extrudes in a predictable way

dwire is easily editable
dwire does not extrude easily in a predictable way (if created on a plane other than XY)

Q) Why do we have the two entity types wire and dwire. Are they not basically the same?

Can someone please explain the difference between a wire and a Dwire?

With reference to post https://forum.freecadweb.org/viewtopic.php?f=3&t=31485 Is this a bug? A dwire created on a plane other then XY, will still have its Normal in global Z direction. Dropping the dwire to a wire, the resulting wire will have its Normal relative to the plane the dwire was creat...

Is this a bug? A dwire created on a plane other then XY, will still have its Normal in global Z direction. Dropping the dwire to a wire, the resulting wire will have its Normal relative to the plane the dwire was created on. Resulting in: Extruding a dwire will always result in an extrusion in globa...