Ubuntu 18. Failed to connect to https://changelogs.ubuntu.com/meta-release-lts. Check your Internet connection or proxy settings

resolve_meta_release_lts_check_error.sh

sudo rm /var/lib/ubuntu-release-upgrader/release-upgrade-available
sudo /usr/lib/ubuntu-release-upgrader/release-upgrade-motd

I cannot reach https://changelogs.ubuntu.com/meta-release-lts using ipv6, I can using ipv4 by e.g.

curl -6 -v  https://changelogs.ubuntu.com/meta-release-lts
*   Trying 2620:2d:4000:1::2a:443...
* TCP_NODELAY set
* Connected to changelogs.ubuntu.com (2620:2d:4000:1::2a) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: /etc/ssl/certs/ca-certificates.crt
  CApath: /etc/ssl/certs
* TLSv1.3 (OUT), TLS handshake, Client hello (1):

curl -4 -v  https://changelogs.ubuntu.com/meta-release-lts
*   Trying 185.125.190.17:443...
* TCP_NODELAY set
* Connected to changelogs.ubuntu.com (185.125.190.17) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: /etc/ssl/certs/ca-certificates.crt
 CApath: /etc/ssl/certs
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):

However, preferring ipv4 over ip6 by editing /etc/gai.conf and setting precedence ::ffff:0:0/96 100 does not solve it.

super!

Work for me, thanks !!

sudo rm /var/lib/ubuntu-release-upgrader/release-upgrade-available
sudo /usr/lib/ubuntu-release-upgrader/release-upgrade-motd