Can You make a sudo apt update and post the Output here please?
The kelebek333 ppa is added, but something seems to be wrong with this driver package. I found a thread from 2024, there was shown the same error:
Even the installation with gdebi failed there.
If you really want to try that, please save your datas before.
Edit:
I found also threads where another command is used to install the 340 nvidia drivers from the kelebek333 ppa. You could try it with
sudo apt install nvidia-340-updates nvidia-340-updates-dev xorg-modulepath-fix
@Aravisian Can the packages of the kelebek333 ppa for jammy be listed to see if the name is wrong? On the launchpad website of the ppa is shown the package as 'nvidia-graphics-drivers-340`.
this one I think did go through 
but when running this one again after
sudo apt update && sudo apt install nvidia-graphics-drivers-340
it still ends up at the end with the E: error not finding 340 packages
You don't need this command. The other one looks good, I think.
Now reboot.
Yes, and I did this last night, but was baffled by what I was seeing.
Yes, the updates and other peripheral packages are listed with .debs, but the entire driver collection needs to be; it isn't.
I am not sure what is going on there - We used to use this solution and it worked. Now, it does not.
As you point out in listing that other thread.
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Is the proprietary driver now running or nouveau?
Currently, the user is falling back to minimal Nouveau driver.
in terminal it says nouveau but "software and updates" says nvidia
Software & Updates is not going by kernel probing, as the terminal relays. Instead, it assumes the driver in use due to its installation files.
Which command did you use to show the packages for Jammy? I tried to find out the packages, but on my ubuntu noble based system there were only shown packages from the kelebek333 ppa for ubuntu noble at /var/lib/apt/lists after adding the ppa.
I haven't found out yet how to display the packages for another ubuntu version.
Do you think it is worth a try with the .run file of nvidia?
Hmm ... only a vague Idea but the other Packages are named:
Based on this maybe try as Packages Name:
nvidia-340-drivernvidia-340-driversnvidia-340-graphics-drivernvidia-340-graphics-driversnvidia-340-graphic-drivernvidia-340-graphic-drivers
I'm wondering if the nvidia-graphics-drivers-340 installation fails because it is a tar.gz file. All other packages are .deb files. Would it help to download the tar.gz package for Jammy manually and then unzip it and then doubleclick to install? I don't know if the tar.gz package contains all other packages of this site or if you also need further packages from this site shown for Jammy. What do you think? Maybe it could help to install all amd64 .deb files for Jammy from here:
Can apt install a tar.gz file?
No, apt cannot install a tar.gz.
Usually, a tar.gz contains an installer script or is installed with make.
That said, would this be the driver package?
https://ppa.launchpadcontent.net/kelebek333/nvidia-legacy/ubuntu/pool/main/n/nvidia-graphics-drivers-340/nvidia-340_340.108-4ppajammy9.2_amd64.deb
Are you asking me? I couldn't unzip the tar.gz on my phone to see the content, I have to start my computer first.
So apt does not find tar.gz packages? Is that the reason for the error message?
It does not. It deals with .deb packages.
If there are none, it will report "file not found" results.
Yes... LOL, I was asking based on the name. I went ahead and downloaded it and examined the contents and it appears to be the driver, so @smsdalle, I see no harm in trying it.
It won't break the system if it does not work.
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Now I found what you mean. I took a look at the tar.gz package but didn't understand how to use it.
You have linked the link to the 'nvidia-340' package. It's the right name.
The installation should also work with
sudo apt install nvidia-340
These days, it is less common to need to install a tar.gz. Generally, only uncommon or specialized niche software is only available as a tar.gz.
Do you only need this one .deb package, no other ones (dkms...)? Does the driver also work when you switch to kernel 6.8? In threads I read that the 340 driver of the ppa worked with 6.8 kernel.