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Gradientik · 10 January 2021 12:11

Dear experts,

I have some issues with flair after installed
After selecting the Flair “Geometry” tab, it crashes with an error:

Others tabs (Input, Plots etc) work fine.

Versions:
Windows10 / WSL2 / Ubuntu 20.04
Fluka 4.1
Flair 3.1.7

Best regards,
Nikita

horvathd · 10 January 2021 12:40

Dear Nikita,

did you try to launch Flair directly from the WSL terminal?

Which X server (Xming, MobaXterm, etc.) are you using in windows?
Also, did you install flair and flair-geoviewer from the deb packages / repository, or did compile from source?

Cheers,
David

Gradientik · 10 January 2021 13:17

Hello David!

No, I launch Flair from Ubuntu Konsole using XRDP. When I tried launch Flair using WSL Terminal I got error:
*(flair.py:18201): Gdk-CRITICAL *: 15:48:45.742: gdk_cursor_new_for_display: assertion ‘GDK_IS_DISPLAY (display)’ failed
no display name and no $DISPLAY environment variable

I installed Flair and Flair-geo from repository.

Best regards,
Nikita

horvathd · 10 January 2021 13:29

Dear Nikita,

it seems the problem can be with the Linux desktop environment you installed. (Could be this bug report: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1882440)

Please, try to follow guide below, by installing MobaXterm, and running the setup_wsl.sh script to set the $DISPLAY environment variable. This will allow to run Flair directly from the WSL Windows terminal.

github.com

horvathd/cern_fluka_wsl/blob/master/README.md

# Installing CERN's FLUKA and Flair on Windows 10 using WSL

It is recommended to use the Windows Subsystem for Linux (WSL) for running CERN's FLUKA and Flair on Windows 10.
The Windows Subsystem for Linux lets developers run GNU/Linux environment - including most command-line tools, utilities,
and applications - directly on Windows, unmodified, without the overhead of a virtual machine.

## 1. Required software

### 1.1. Windows Subsystem for Linux

Windows Subsystem for Linux requires Windows 10 (build: 16299 [2017 Fall update] or greater) and admin rights during installation.

#### 1.1.1. Enable Windows Subsystem for Linux

Start a *PowerShell* as *Administrator* and run the following command:

> `Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Windows-Subsystem-Linux`

When the command asks, reboot the PC to finalize the installation.

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Cheers,
David

Gradientik · 10 January 2021 17:19

Dear David,

Thank you for advice! I done algorithms that description in your post.

Flair launched from WSL-Terminal with MobaXterm now. But, after selecting Geometry tab I have Error:

Best regards,
Nikita

horvathd · 10 January 2021 17:38

Dear Nikita,

that is strange. Try to update the installed packages of Ubuntu with:

sudo apt update
sudo apt upgrade

If it doesn’t work and you are not using WSL for other software, you could try resetting it (See section 5 of the guide) and reinstalling Flair (with the setup_wsl.sh script it is done automatically) and FLUKA.

Cheers,
David

Gradientik · 11 January 2021 09:18

Dear David,

I reinstalled full Ubuntu-20.04 under wsl2 using your instructions. Everything fine!

Thank you so much

Best regards,
Nikita