# Cannot reset "Open Data With" default reader for .vtu files on Kubuntu

**URL:** https://discourse.paraview.org/t/cannot-reset-open-data-with-default-reader-for-vtu-files-on-kubuntu/17496
**Category:** ParaView Support
**Tags:** vtk
**Created:** [March 27, 2026, 3:49pm UTC](https://discourse.paraview.org/t/cannot-reset-open-data-with-default-reader-for-vtu-files-on-kubuntu/17496 "2026-03-27T15:49:30Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Daniel\_Marco](https://discourse.paraview.org/user_avatar/discourse.paraview.org/daniel_marco/32/17554_2.png) [@Daniel\_Marco](https://discourse.paraview.org/u/Daniel_Marco)
#### Post date: [March 27, 2026, 3:49pm UTC](https://discourse.paraview.org/t/cannot-reset-open-data-with-default-reader-for-vtu-files-on-kubuntu/17496/1 "2026-03-27T15:49:30Z")

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I am an aerospace student using **SU2** for wing simulations. I accidentally checked the “Set reader as default” box for `.vtu` files, selecting the **OpenFOAM reader**. Now, ParaView skips the “Open Data With” selection dialog and attempts to force-load my binary SU2 files as OpenFOAM cases, causing a `vtkXMLUnstructuredGridReader` error (Line 26: invalid token).

**Environment:**

- **OS:** Kubuntu 24.04 (KDE Plasma)

- **ParaView Version:** 5.11.2

- **Installation Method:** `sudo apt install`

**Steps Taken (that did not work):**

1. Deleted `~/.config/ParaView/ParaView-UserSettings.json`.

2. Uninstalled and reinstalled via `apt purge`.

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<div class="post-metadata">

### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [March 30, 2026, 11:33am UTC](https://discourse.paraview.org/t/cannot-reset-open-data-with-default-reader-for-vtu-files-on-kubuntu/17496/2 "2026-03-30T11:33:24Z")

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> [@Daniel\_Marco](#):
>
> ~/.config/ParaView/

delete the whole folder