Where are the intermediate CA certificates?

In the folder /etc/ssl/certs/ i can well see: - Symbolic links to the certificates stored at /usr/share/ca-certificates/ - The BUNDLE file ca-certificates.crt which contains all certificates in PEM format I see only root CA certificates...i don't see the intermediate CA certificates ? Why ? For example, with Let's encrypt CA, i can well find: - ISRG_Root_X1.pem - ISRG_Root_X2.pem But where are the Let's encrypt intermediate certificates ? At the day i write this question, there are 4 intermediate CR certificates: - E5 - E6 - R10 - R11 I guess there are somewhere on my computer, because i can successfully establish an SSL connection to a server (using let's encrypt certificate).