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WARNING: ca-certificates.crt does not contain exactly one certificate or CRL: skipping

c_rehash is always logging this spurious warning, which is confusing.

WARNING: ca-certificates.crt does not contain exactly one certificate or CRL: skipping

This happens because update-ca-certificates writes the file /etc/ssl/certs/ca-certificates.crt before invoking c_rehash /etc/ssl/certs.

update-ca-certificates should:

  1. remove the bundle,
  2. invoke run-parts,
  3. wait until it finishes,
  4. then write the new bundle.

That is also how it works on Debian.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information