Until recently, I did not know of a way to install Signal-Desktop on arm64 devices like Librem 5 and PinePhone. I had read months ago that there were problems when trying to compile it for arm64, but I just came across Signal-Desktop-Builder by 0mniteck on the Mobian wiki. I would like to try it out, but I am having difficulty verifying the download and am looking for help from the community here.
I am having trouble importing the public key in order to verify the signature of the signal-desktop_5.16.0_arm64.deb file.
Public Key: 0558260a88ff08f8dddf791fe73b9457917830506be3d8dbc1311e8d769c5ac777