Attempting wine-stable install on Xubuntu 18.04.1 using install instructions on winehq.org:
Obtaining a key was straightforward using this command:
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wget -nc https://dl.winehq.org/wine-builds/Release.key && sudo apt-key add Release.key
On attempt to "apt-get" the package, this message presents:
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The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 818A435C5FCBF54A
Ign:6 https://download.opensuse.org/repositories/Emulators:/Wine:/Debian/Ubuntu_18.10_standard ./ InRelease
Hit:7 https://download.opensuse.org/repositories/Emulators:/Wine:/Debian/Ubuntu_18.10_standard ./ Release
Get:8 http://us.archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages [381 kB]
Get:10 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages [427 kB]
Get:11 http://us.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 Packages [573 kB]
Get:12 http://us.archive.ubuntu.com/ubuntu bionic-updates/universe i386 Packages [568 kB]
Reading package lists... Done
W: GPG error: https://dl.winehq.org/wine-builds/ubuntu bionic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 818A435C5FCBF54A
E: The repository 'https://dl.winehq.org/wine-builds/ubuntu bionic InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
Thanks!