Can't install kernel updates

After testing on another computer I installed Netrunner 14 yesterday on a partition on my work computer intending to transition to it from Netrunner Dryland for my work install, but yesterdzay and this morning I have been unable to update the kernel. The computer has been rebooted between atempts. I admit I have only looked briefly for a solution. This is my error message: 404 Not Found [IP: 80] 404 Not Found [IP: 80] 404 Not Found [IP: 80] 404 Not Found [IP: 80]

Thanks for any observations.

The files aren’t available anymore and got replaced with newer ones.
I guess your cache is not up to date. You can update it either in Muon or Synaptic by reloading the software list or executing sudo apt-get update from within a terminal.

Thanks! That did the trick. I thought I had updated them, but obviously not.