GrayJay FlatHub worked on Kubuntu 25.04 frozen screen on Kubuntu 26.04

[claydoh]

I myself haven't used anything Nvida in about a decade, but others here do.

Cuda itself may not be the culprit, but the actual Nvidia video drivers should be available via the Driver Manager in System Settings, which is the official and supported method to get them, along with the ubuntu-drivers command in the terminal.

Being that 26.04 is still a pre-release and a shiny fresh kernel version 7, it is a possibility that cuda and related software might not have support, just yet.

[JoshiFresa]

I myself haven't used anything Nvida in about a decade, but others here do.

Cuda itself may not be the culprit, but the actual Nvidia video drivers should be available via the Driver Manager in System Settings, which is the official and supported method to get them, along with the ubuntu-drivers command in the terminal.

Being that 26.04 is still a pre-release and a shiny fresh kernel version 7, it is a possibility that cuda and related software might not have support, just yet.

Actually Kubuntu is not listed as supported by Nvidia but it still worked for me in the 25.04 version of Kubuntu. But yeah I'll cross my fingers since the most important thing for me is to be able to use the Nvidia card at some point. And yes I installed Nvidia drivers via the terminal. The last version did not work but another earlier version worked fine. I'll reinstall and report my results.

[claydoh]

Actually Kubuntu is not listed as supported by Nvidia

Kubuntu IS Ubuntu so yes it is supported. They are the same exact OS from the same exact place, under the desktop GUI.

If you are downloading and installing Nvidia stuff from Nvidia, THAT is probably where the problems lie. They greatly prefer people to use the distro packaging for proper compatibility and surviving kernel and system updates, etc.

Use the Driver Manager after uninstalling all traces of the Nvidia driver install, if you did this.

If you did use the driver manager back in 25.05, go back to it to see what it shows.

[JoshiFresa]

[QUOTE=claydoh;n691254]
Kubuntu IS Ubuntu so yes it is supported. They are the same exact OS from the same exact place, under the desktop GUI./QUOTE]

Thanks for the valuable info, I'm aware it's all Debian/Ubuntu but didn't understand it's the same exact OS. That helps.

I also did my homework and read that it's not a good idea to install Nvidia from the files onsite. So I learned to install it in the terminal from the driver archive of Kubuntu. I have removed the Cuda toolkit yesterday, also to learn, but not the Nvidia install yet. The Nvidia driver 580:i386 that worked for me. I checked now nvidia-sm and it returns "command not found" instead of the nice panel. Then I used "dpkg -l | grep -i nvidia". What is the best command to remove the Nvidia drivers in the terminal. I installed the Nvidia drivers in the terminal by checking the versions in different places including the driver manager but I did not use it to install. That's new to me.

[JoshiFresa]

Here is the driver manager

[JoshiFresa]

What I see now concerning cuda/nvidia

[JoshiFresa]

This is what nvidia -smi looked like before it stopped working

[JoshiFresa]

Now this is weird. I have 2 slightly different driver managers and they show different results. What does the "revert" option do? Would it help me to remove the Nvidia driver and I would reinstall it with "apply changes"?

[claydoh]

I have 2 slightly different driver managers

You must have the Qt version that comes with Kubuntu/Lubuntu, as well as the Gtk one that normally comes with Ubuntu and other gtk-based desktops. No harm here as long as you don't tryu to actually use both at the same time to change settings/

they show different results

You have both open together, and the driver manager probably is locked to prevent multiple instances from running.

What does the "revert" option do?

I think it just undoes the selection, and re-selects the previously installed option.

Now, I see the message at the top about the 'alternative driver' -- if you manually installed a driver downloaded directly from Nvidia DO NOT USE THIS TOOL!! This very likely will break your graphics.

You would want to completely uninstall that, reboot, hope it hasn't broken your graphics, THEN use the driver manager - it will mark one as "recommended".

But this is beyond my personal experience since ~2016, so I am not the greatest of guides here.

[JoshiFresa]

Now, I see the message at the top about the 'alternative driver' -- if you manually installed a driver downloaded directly from Nvidia DO NOT USE THIS TOOL!! This very likely will break your graphics.
You would want to completely uninstall that, reboot, hope it hasn't broken your graphics, THEN use the driver manager - it will mark one as "recommended".
But this is beyond my personal experience since ~2016, so I am not the greatest of guides here.

I don't think I installed a downloaded file from Nvidia, did I? The command I used was "sudo apt install nvidia-driver 580" That's all. And the resulting Nvidia driver app does not look complete. The question is knowing what is the best command to uninstall the current driver and the command to re-install.

[JoshiFresa]

The driver app is still showing

[claydoh]

I don't think I installed a downloaded file from Nvidia, did I?

I have no idea, you didn't say how you installed the driver, before. And you would have been the one going to Nvidia and downloading a file

The command I used was "sudo apt install nvidia-driver 580"

That is probably OK, but again, I am not really 100%, maybe 98.275%


Ok, then you are safe to use the driver manager. There doesn't seem to be anything wrong on the surface with your drivers, and if everything else is fine, particularly media playback on other apps and browsers, then the issue is somewhere with Grayjay.

There is zero reason to uninstall and reinstall the driver. If you had performance issues or glitches, maybe switching to a different driver can be warranted.

And the resulting Nvidia driver app does not look complete.

How so?

I think that to change most settings, you still need to launch the Nvidia Settings app with sudo privileges, Again, not positive on that today. I would have thought that there would be
a menu entry for this.

I will have to defer to the Nvidia users on this one.

[JoshiFresa]

I have no idea, you didn't say how you installed the driver, before. And you would have been the one going to Nvidia and downloading a file .

I know its sounds dumb but each small thing is a discovery for me. I had to search what command I used to install Nvidia drivers, I can't remember them by heart yet. And I had actually downloaded the file from Nvidia but after reading about it I finally decided to not install it, what they call "nouveau" driver, although I still know very little about what it entails. I asked you because you may see something I don't. What I did is install with "sudo apt-get install nvidia-driver-580 nvidia-dkms-580". I had tried with the 590 version before but it did not work in my case, so I downgraded to 580 and the nvidia -smi command finally gave me a result as above in this post.

I seem to have only 2 driver choices to install my Nvidia card. The 580 and 595. Here is what I see when I do "sudo ubuntu-drivers list --gpgpu


I know its sounds dumb but each small thing is a discovery for me. I actually downloaded the file from Nvidia but after reading about it I decided to not install what they call nouveau, although I still know very little about what it is. I asked you because you may see something I don't. What I did is install with sudo apt-get install nvidia-driver-580 nvidia-dkms-580. I had tried the 590 but it did not work so I downgraded to 580 and the nvidia -smi command gave me a result as above in this post.

I seem to have only 2 driver choices to install my Nvidia card. The 580 and 595. Not sure if this is all there is for my case?. Here is what I see with "sudo ubunto-drivers list --gpgpu"

nvidia-driver-595-server-open, (kernel modules provided by linux-modules-nvidia-595-server-open-generic)
nvidia-driver-580-server-open, (kernel modules provided by linux-modules-nvidia-580-server-open-generic)
nvidia-driver-595-server, (kernel modules provided by linux-modules-nvidia-595-server-generic)
nvidia-driver-580-server, (kernel modules provided by linux-modules-nvidia-580-server-generic)
nvidia-driver-595-open, (kernel modules provided by linux-modules-nvidia-595-open-generic)
nvidia-driver-580-open, (kernel modules provided by linux-modules-nvidia-580-open-generic)
nvidia-driver-595, (kernel modules provided by linux-modules-nvidia-595-generic)
nvidia-driver-580, (kernel modules provided by linux-modules-nvidia-580-generic)

Now since you told me I have the risk of breaking graphics, how can I check that my Nvidia is still alive? Because I've been re-installing driver 580 with no result, "nvidia -smi" showing nothing in the new Ubuntu kernel. You also said that this new kernel of Kubuntu may not support Nvidia. Some people say they have to block the nouveau in some cases. Others that they had to install some other aspects to get their Nvidia drivers to finally install. What is confusing is that the Ubuntu drivers for Nvidia say "proprietary", so it sounds as if it were a nouveau package. I'm still processing things. Thanks for your patience.

[JoshiFresa]

dpkg -l | grep -i nvidia
This is what is installed at the moment after trying driver 595 in vain also.

[claydoh]

Again you didn't manually download a file directly from Nvidia to install a driver. That is good. Don't worry about breaking things dealing with that,

Again, If video playback works fine in your browser and other video players (vlc, etc) then the freezing problem is very likely specific to grayjay.

I don't think Nvidia video drivers are broken, as I mentioned ,you need to run nvidia-settings with sudo privileges for all the settings and features.

I think we are going into the weeds unnecessarily, apologies for dragging things down there.

I have no experience with Cuda, that itself could well be broken, if the installation method you used specifically for Cuda does not yet support this very new kernel, and *buntu still being in a pre-release state.

This is what nvidia -smi looked like before it stopped working

So, what does it show now?


We really need someone with Nvidia experience here. I don't know where to go or what to ask, in terms of data gathering.