If you want to verify it, you should download/use the .appimage Linux binary and its own signatures, and proceed to verify that.
The binary i downloaded from the repo...do you know where or how to get the appropriate sig file, or where its path would be if it installed together with the download? If you could spellout the process on how to verify the linux binary electrum it would be very helpful, thanks
You are running Manjaro and installing Electrum using Pacman/Pamac right?
Ideally, all the signature verifying processes have been done by Pacman itself. If you installing that way, the things you need to verify is the Electrum package maintainer/signer from the official repository of your distro. In that case, you have to trust and verify the packager maintainer and signer not to tamper with the direct Electrum source code. See more and how here:
pacman/Package signingIf you are going that way, I think that is not the best way to use Electrum. Instead, I suggest you should use and verify the wallet directly from the official website of Electrum. That way, you are able to use/verify the app directly from Electrum developers. You can refer to @BitMaxz post about that.