Cannot create mesh due to missing libnglib.so

[Eriks Dobelis]

Using 20.04 updated on March 10, 2020. Freecad package 0.18.4+dfsg2-1ubuntu2.

Using Mesh workbench I was trying to create a mesh from solid using "Create mesh from shape..." menu. Using default settings empty mesh was created with no vertices nor edges (solid was not empty). Using python console I tried to `import MeshPart` and got an error message ...libnglib.so not found...

Fix in 2 steps:
1) I had to install libnglib-6.2.1804. As mesh workbench is one of default workbenches of Freecad I suppose it should be a dependency for freecad package.
2) Package installs .so files into /usr/lib/x86_64-linux-gnu/netgen folder and the same error is still produced (even after ldconfig). After I added this folder path to x86_64-linux-gnu.conf and rerun ldconfig, `import MeshPart` works in Freecad's python console, and "Create mesh from shape..." produces usable mesh.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: freecad 0.18.4+dfsg2-1ubuntu2
ProcVersionSignature: Ubuntu 5.4.0-14.17-generic 5.4.18
Uname: Linux 5.4.0-14-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu19
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Mar 10 22:42:58 2020
PackageArchitecture: all
SourcePackage: freecad
UpgradeStatus: Upgraded to focal on 2020-02-16 (23 days ago)
modified.conffile..etc.default.apport: [modified]
mtime.conffile..etc.default.apport: 2014-02-28T14:49:36

[StarAurryon (staraurryon)]

Hello,

I confirm the bug on my side.

The package libnglib-6.2.1804 should be set as a dependency for freecad deb.

In addition, I had, like mentioned previously, to:
- Add /usr/lib/x86_64-linux-gnu/netgen to /etc/ld.so.conf.d/x86_64-linux-gnu.conf
- Run sudo ldconfig

Best regards,

Aurryon

[Launchpad Janitor (janitor)]

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

[Wolfgang Wallner (wolfgang-wallner)]

I can confirm this bug on Kubuntu 20.04 with freecad 0.18.4+dfsg2-1ubuntu4 (tested with FreeCAD's Path workbench). The procedure described in the bug report and in post #2 fixes it for me.

regards, Wolfgang

[Maurizio Scarpa (scarpam72)]

I also faced the same issue (Ubuntu 20.04) and resolved with the procedure described in the bug report

[daryooosh (daryooosh)]

I also had same problem (fresh install of Ubuntu 20.04) and is resolved with the recipe in original post.

[Jakub Niemczuk (halogenek)]

I have this problem too on Ubuntu 20.04. Fixed with solution from the bug report.

[Ponik (ponik)]

On Ubuntu 20.04 I've had same problem and used solution from above.

But on clean installation of Ubuntu 20.10 on same machine creating mesh from shape is working perfectly without any workaround. "Standard" and "Mefisto" options are working, "Netgen" is inactive. libnglib-6.2.1804 is not installed.

[Nathaniel Jay Stenzel (nathaniel-stenzel)]

This is still a problem with version 0.18.4 on Linux Mint. Maybe it is fixed in 0.19? At any rate, I installed the missing package to fix it.