Add warning to remove mina-generate-keypair

docs/node-operators/block-producer-node/connecting-to-the-network.mdx

@@ -36,6 +36,10 @@ The first step to connecting to Mainnet is to install the latest daemon version.
 
 To install the latest [Mainnet **Stable** Release 3.0.0](https://github.com/MinaProtocol/mina/releases/tag/3.0.0), use the [Installation](/node-operators/block-producer-node/getting-started#installation) steps for your environment.
 
+:::caution
+If you have `mina-generate-keypair` installed, you will need to first `sudo apt remove mina-generate-keypair` before installing `mina-mainnet=3.0.0-93e0279`. The `mina-generate-keypair` binary is now installed as part of the mina-mainnet package.
+:::
+
 ## Start a standalone mina node
 
 **Note:** A known issue exists with the Hetzner hosting provider. If you are using Hetzner, follow the [Networking troubleshooting](/node-operators/troubleshooting#my-hosting-provider-is-warning-me-abuse-message-netscan-detected) guidance before you start a node.