From the Download | Solus page, I downloaded the SHA256SUMS: File | Signed File | Public Key (all three files) for the XFCE version and imported the public key using gpg --import solus-releng-pub.gpg
(on Linux Mint).
When I tried to verify the file, this is the result:
$ gpg --verify Solus-XFCE-Beta-Release-2025-01-26.iso.sha256sum.sign Solus-XFCE-Beta-Release-2025-01-26.iso.sha256sum
gpg: Signature made Fri 24 Jan 2025 07:31:28 PM EST
gpg: using RSA key F5F6685CAF5559771D9CCB92618EB3600BD32D59
gpg: BAD signature from "Solus (Release & Engineering) <releng@getsol.us>" [unknown]
Thinking that the "BAD signature" message might only apply to the XFCE version, I downloaded and verified the Budgie sha256sum, with the same result:
$ gpg --verify Solus-Budgie-Release-2025-01-26.iso.sha256sum.sign Solus-Budgie-Release-2025-01-26.iso.sha256sum
gpg: Signature made Fri 24 Jan 2025 07:31:20 PM EST
gpg: using RSA key F5F6685CAF5559771D9CCB92618EB3600BD32D59
gpg: BAD signature from "Solus (Release & Engineering) <releng@getsol.us>" [unknown]
Is there something I need to do differently to verify the sha256sum file?