error when accessing the Assembly 4 workbench

[dwebman]

OS: Ubuntu 16.04
Freecad Version: 0.19 freecad-daily:
Installed: 0.19~pre2~202001071536~ubuntu16.04.1
Candidate: 0.19~pre2~202001071536~ubuntu16.04.1
Version table:
*** 0.19~pre2~202001071536~ubuntu16.04.1 500
500 http://ppa.launchpad.net/freecad-mainta ... ily/ubuntu xenial/main i386 Packages
100 /var/lib/dpkg/status
The error is:
Workbench failure
Internal C++ object (PySide.QtGui.QToolBar) already deleted.
Traceback (most recent call last):
File "<string>", line 223, in Activated

Any ideas or advice?

[vocx]

OS: Ubuntu 16.04
...
Internal C++ object (PySide.QtGui.QToolBar) already deleted.
Traceback (most recent call last):
File "<string>", line 223, in Activated
Any ideas or advice?

This sounds like it could be a problem with your version of Qt.

Since you are using an old version of Ubuntu, maybe some features don't work if you don't use a reasonably recent Qt, like Qt 5.9. I think most users are using some version between 5.9 and 5.12.

Why not upgrading to Ubuntu 18.04? FreeCAD works quite well in this version.

[dwebman]

Thank you. I'll try the upgrade of Ubuntu.