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Hi, 

thanks. I just get an segmentation fault in the terminal.

The syslog says:

2026-07-01T09:21:33.655369+02:00 knorke kernel: freeview[8000]: segfault at 20 ip 00007097ff503afd sp 00007ffe90edef78 error
4 in libQt5Core.so.5.15.13[303afd,7097ff28e000+336000] likely on CPU 15 (core 27, socket 0)
2026-07-01T09:21:33.655393+02:00 knorke kernel: Code: 29 3d 0d 00 48 89 17 c3 0f 1f 44 00 00 f0 83 01 01 c3 90 66 2e 0f 1f 8
4 00 00 00 00 00 f3 0f 1e fa 48 8b 4f 08 83 e6 01 01 f6 <0f> b6 51 20 89 d0 83 e2 fd d0 e8 09 f2 88 51 20 83 e0 01 c3 90 66
2026-07-01T09:21:33.727669+02:00 knorke konsole[7990]: qt.core.qobject.connect: QObject::disconnect: Unexpected nullptr para
meter

Does that provide any clue?

How can it be that freeview started like a charm and now gives a seg fault just after having tried to increase the font size by 2,

and that this persists even with a fresh installation?

Cheers,

Andreas

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The freesurfer install and/or the freeview application may not be an issue.  If you are using NVIDIA graphics drivers instead of the system X.org drivers, then it might be that changing graphics setting in an X-windows application like freeview may not work for every possible setting you can choose in the application.  I see quite a few postings online about X-windows applications having graphics/font scaling issues on Ubuntu24 depending upon how the system is setup.  If there is no error displayed in the terminal session, you could look in the system log /var/log/syslog to see if there is any graphics related errors listed there.

-R.

On Jun 30, 2026, at 15:47, Andreas Bartsch <bartsch@radvisory.net> wrote:

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Hi,

I had sucessfully installed freesurfer 8.2.0 on Ubuntu 24.04 LTS Noble Numbat.

Freeview was running.

I then changed the font size under preferences from 12 to 14.

Since then, I am getting a segmentation fault when I want to run freeview.

I even did

sudo apt purge freesurfer
sudo apt install ./freesurfer_ubuntu24-8.2.0_amd64.deb
sudo FREESURFER_HOME=/usr/local/freesurfer/8.2.0 bash fs820_updates.sh

for a fresh clean re-installation but am still getting a crash of freeview whenever I am trying to start it.

Any remedy?

Cheers,

Andreas

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