Freecad's start workbench points to missing webgui -> almost empty gui

[Michael]

[Impact]

 * Using freecad 0.16.6712+dfsg1-1ubuntu2 from Ubuntu 18.04, the Start Workbench is broken due to a missing Qt4 dependency of WebGui.

 * Backporting the proposed fix will prvent FreeCAD from building the affected Workbench as well as changing the default to the Part Workbench.

 * The proposed upload will fix the issue by setting the default workbench to "PartWorkbench" in src/Main/MainGui.cpp. Additionally, the pacakage rules file is modified to prevent the Start Workbench from being built.

[Test Case]

 * On Ubuntu 18.04, install freecad and run normally.

 * An empty Start Workbench is loaded. The message "No module named WebGui" is logged in the report view.

[Regression Potential]

 * All functionality provided by the Start Workbench will be unavailable.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Mohammed Shaikh (mumararshaikh)]

The same issue is noted on Ubuntu 18.04 Wayland.

On XServer it didn't run and shows error "Unable to create drawable".

Screenshot : https://imgur.com/a/vbl7p1O

[Jason Daborn (mtx-lives)]

Same here, at first you are met with a very sparse window, but FreeCad is thankfully usable if you use the view drop down and select a workbench

[maleous (maleous)]

I have prepared a change to the Debian package that will eliminate this issue.

[Mathew Hodson (mhodson)]

Fixed in 0.17+dfsg1-1

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Simon Quigley (tsimonq2)]

Hi Zachary! Apologies for the delay in reviewing your patch.

I only uploaded the patch that applies to this bug, as the other one was marked as a duplicate.
I changed the version to 0.16.6712+dfsg1-1ubuntu2.1 to match the Stable Release Update guidelines.

~ubuntu-sponsors has been unsubscribed, please resubscribe them if the patch needs to be tweaked prior to acceptance.

Thank you for your contribution!

[Brian Murray (brian-murray)]

The upload to the SRU queue for Bionic does not match the debdiff attached to this bug nor this bug's description. Why was the debian/rules file change dropped?

[Robie Basak (racb)]

Reminder: SRU processing is currently blocked pending the answer to Brian's question in comment 9. If it remains blocked, the upload will get rejected from the queue.

[Brian Murray (brian-murray)]

An upload of freecad to bionic-proposed has been rejected from the upload queue for the following reason: "This was rejected from the queue to questions from the Ubuntu SRU team which were unanswered.".