Hi, from the official How to verify your Ubuntu download page:
This is actually a really useful message, as it tells us which key or keys were used to generate the signature file. Knowing these ID numbers (46181433FBB75451 and D94AA3F0EFE21092 in the example), means we can request them from the Ubuntu key server.
This is done with the following command. Note that the ID numbers are hexadecimal, so we prefix them with
0x:
gpg --keyid-format long --keyserver hkp://keyserver.ubuntu.com --recv-keys 0x46181433FBB75451 0xD94AA3F0EFE21092 Trying this:
gpg: Server indicated a failure
Is this a problem with a server or with a documentation?
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