The error below is from starting a Tezos node (on Windows Linux Subsystem - Ubuntu 18.04) on the Alphanet:
./tezos-node run --rpc-addr 127.0.0.1:8732
Apr 6 21:13:53 - node.main: Starting the Tezos node...
Apr 6 21:13:53 - node.main: No local peer discovery.
Apr 6 21:13:53 - node.main: Peer's global id: idqx3xmhXtg7fhxSaqSBcWSU1ELdPm
Apr 6 21:13:53 - node.worker: bootstrapping chain...
tezos-node: Error:
MDB_CORRUPTED: Located page was wrong type