I get this error message from the eos-update-notifier since yesterday. I’ve got a GT520 graphics card that needs the version 390 of the NVIDIA driver. The currently installed driver is aur/nvidia-390xx-dkms 390.144-2 (+31 0.51)
Is this an EOS problem or an AUR problem?
Is that the whole error message? Can you continue with the upgrade if you ignore this message? It seems like a warning to me, as you’re already at the latest version of the 390 driver.
Can you post the results of yay -Syu?
Thanks for the report!
It looks like a problem with eos-update-notifier.
So I suggest, for now, use pacman or yay directly for updating manually.
For example:
yay
or
sudo pacman -Syu
The reason was found and a fix is already on its way to the mirrors near you.
The problem was in the shared code, package eos-bash-shared.
Again, thanks for the report! 
Thanks. I just upgraded using yay and the error message doesn’t show up after reboot 
Just in case it’s relevant, I received this error today 24 days later after op post.
I just started using the nvidia-470xx-dkms the other day when the nvidia driver stuff went down.
I used yay -Syu
It uninstalled the dkms, then it put it back in.
As far as I can tell it worked ok
Entire error for reference
Arch & EndeavourOS update check:
:: Searching Arch & EndeavourOS for updates...
freecad 0.19.2-4 -> 0.19.2-5
libdbusmenu-qt5 0.9.3+16.04.20160218-5 -> 0.9.3+16.04.20160218-6
linux 5.14.15.arch1-1 -> 5.14.16.arch1-1
linux-headers 5.14.15.arch1-1 -> 5.14.16.arch1-1
thunderbird 91.2.1-1 -> 91.3.0-1
==> eos-kernel-nvidia-update-check: error: 'linux' would be upgraded but 'nvidia' not.
Stop upgrade (Y/n)?
Support for the 470 series was missing from the updater, but now it should be fixed.
You can simply ignore the warning and continue.