You could install it alongside Bitcoin Core. Once it has synced you can pass user/password and it will use your bitcoind instead of remote blocks. Read the README, it's all there:

```
add-apt-repository ppa:lightningnetwork/ppa
apt update
apt install lightningd
mkdir -p ~/.lightning/plugins
echo 'disable-plugin=bcli' >> .lightning/config
cd ~/.lightning/plugins
wget https://github.com/nbd-wtf/trustedcoin/releases/download/v0.6.1/trustedcoin-v0.6.1-linux-amd64.tar.gz
tar -xvf trustedcoin-v0.6.1-linux-amd64.tar.gz
cd
lightningd
```

franzap

Shall I install it before BTCcore finish the sync? Not really that technical so maybe need some support here ... 

supratic

bitcoin

What are you working on this week?

If you are OK with the tradeoffs this could be interesting: https://github.com/nbd-wtf/trustedcoin (by fiatjaf) and it's designed for CLN. Never tried it though