For those who's having issue migrating db to new machine

[dragon0087]

The sync is really slow from scratch. So I want to copy the db from my almost synced Windows to my new Ubuntu machine. Here is what I did

1. On Ubuntu I do "chia keys add" with the 24 words
2. "chia init" on Ubuntu
3. copy the following from windows to Ubuntu
   ~/.chia/mainnet/db/blockchain_v1_mainnet.sqlite
   ~/.chia/mainnet/wallet/db/blockchain_wallet_v1_mainnet_*.sqlite
4. chia start farmer on Ubuntu

Now after this I check the status chia show -s and chia wallet show, both gives me an error. Something like "Connection error. Check if full node rpc is running at 8555"
I did an ss -l and confirm my Ubuntu is not listening on these RPC ports. However the port 8444/8447 are running. But when I delete those file, start farmer again and it works right away. So for some reason it doesn't like the db files I copied.
I then thinking maybe the file is corrupted somehow, so I opened Windows full node again, let it sync for a few mins, then do a proper chia.exe stop node. Copied the file again then boom, it works!
Just some information for those who's running into this issue.