# How to build PaStiX4CalculiX from source on Ubuntu 22.04

**URL:** <https://calculix.discourse.group/t/how-to-build-pastix4calculix-from-source-on-ubuntu-22-04/3807>\
**Category:** Getting started\
**Created:** [February 28, 2026, 2:25pm UTC](https://calculix.discourse.group/t/how-to-build-pastix4calculix-from-source-on-ubuntu-22-04/3807 "2026-02-28T14:25:06Z")\
**Posts on this page:** 1\
**Showing post:** 12

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**Author:** ![fgr](https://avatars.discourse-cdn.com/v4/letter/f/f4b2a3/32.png) [@fgr](https://calculix.discourse.group/u/fgr)\
**Post date:** [March 4, 2026, 6:24am UTC](https://calculix.discourse.group/t/how-to-build-pastix4calculix-from-source-on-ubuntu-22-04/3807/12 "2026-03-04T06:24:39Z")

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@pzu4 in general handling converge problems with contact elements require a little exercise.

You have huge number of contact elements. If you not already have done any contact exercises with simple flat surfaces ex. having max 10-20 contact surfaces, I will recommend you doing this.

From first look I would guess the contact stiffness could be too high, as a thump you set the contact stiffness as described by JuanP74 here [https://calculix.discourse.group/t/snap-fit-contact-snagging-problem/2277/17](https://calculix.discourse.group/t/snap-fit-contact-snagging-problem/2277/17) to low contact stiffness will cause penetration and to high convergence problems.

Another thumb, due to the contact searching routine, slave surfaces should be smaller than master surfaces.

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