Ubuntu 18.04 and wget error cannot verify certificate

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Here we go..

owcld18:~$ echo | openssl s_client -connect valid-isrgrootx1.letsencrypt.org:443 -servername valid-isrgrootx1.letsencrypt.org | head
depth=1 C = US, O = Let's Encrypt, CN = R3
verify error:num=2:unable to get issuer certificate
issuer= O = Digital Signature Trust Co., CN = DST Root CA X3
CONNECTED(00000005)
---
Certificate chain
 0 s:CN = valid-isrgrootx1.letsencrypt.org
   i:C = US, O = Let's Encrypt, CN = R3
 1 s:C = US, O = Let's Encrypt, CN = R3
   i:C = US, O = Internet Security Research Group, CN = ISRG Root X1
---
Server certificate
-----BEGIN CERTIFICATE-----
DONE
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