opensmtpd-install.sh gives error: Unable to locate package dkimproxy

[JamesHarrisonBaggs]

On Ubuntu 24.04.1 LTS, in WSL after following the previous instructions in fastsetup (./ubuntu-wsl.sh dotfiles.sh) running ./opensmtpd-install.sh gives the error: Unable to locate package dkimproxy

It looks like it's not available in apt

[JamesHarrisonBaggs]

#26 is similar to this, though I'm not sure I understand the other user's last comment. I am not on AMD, though I am using WSL.