[Bug 1973654] [NEW] Using debian-installer on a server with a Let's Encrypt cert dies

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While using debian-installer to install Ubuntu Focal, I get the
following error:

    May 16 22:02:41 base-installer:   Certificate verification failed:
The certificate is NOT trusted. The certificate chain uses expired
certificate.  Could not handshake: Error in the certificate
verification. [IP: 129.59.59.10 443]

There was an issue in 2021, where the "DST_Root_CA_X3.crt" certificate
used by Let's Encrypt expired.

    https://letsencrypt.org/docs/dst-root-ca-x3-expiration-
september-2021/

The problem is that the certificate is still included in the "ca-
certificates_20190110ubuntu1_all.deb" that debian-installer fetches
during install.

    May 16 22:02:17 debootstrap: Preparing to unpack .../ca-certificates_20190110ubuntu1_all.deb ...
    May 16 22:02:17 debootstrap: Unpacking ca-certificates (20190110ubuntu1) ...
    May 16 22:02:31 debootstrap: Setting up ca-certificates (20190110ubuntu1) ...
    May 16 22:02:40 debootstrap: Processing triggers for ca-certificates (20190110ubuntu1) ...
    May 16 22:02:40 debootstrap: Running hooks in /etc/ca-certificates/update.d...

Because the certificate is expired, debian-installer dies with:

    May 16 22:02:41 base-installer:   Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate.  Could not handshake: Error in the certificate verification. [IP: 129.59.59.10 443]
te is NOT trusted. The certificate chain uses expired certificate.  Could not handshake: Error in the certificate verification. [IP: 129.59.59.10 443]

Can Ubuntu update the ca-certificate .deb pulled during install to one
that does not have DST_Root_CA_X3.crt?   Thanks.

** Affects: debian-installer (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Using debian-installer on a server with a Let's Encrypt cert dies
https://bugs.launchpad.net/bugs/1973654
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