When downgrading to the prior package, we do not see this problem.
We've taken the following steps as a work-around:

- apt-get -y --allow-downgrades install libsasl2-2=2.1.26.dfsg1-14build1
- apt-get -y --allow-downgrades install 
libsasl2-modules-db=2.1.26.dfsg1-14build1
- apt-get -y --allow-downgrades install libsasl2-modules=2.1.26.dfsg1-14build1
- apt-get -y --allow-downgrades install 
libsasl2-modules-gssapi-mit=2.1.26.dfsg1-14build1

Then we've used apt-pinning to pin those versions:

Package: libsasl2-2
Pin: release o=Ubuntu version 2.1.26.dfsg1-14build1
Pin-Priority: 999

Package: libsasl2-modules
Pin: release o=Ubuntu version 2.1.26.dfsg1-14build1
Pin-Priority: 999

Package: libsasl2-modules-db
Pin: release o=Ubuntu version 2.1.26.dfsg1-14build1
Pin-Priority: 999

Package: libsasl2-modules-gssapi-mit
Pin: release o=Ubuntu version 2.1.26.dfsg1-14build1
Pin-Priority: 999

And we've used a hold to (temporarily) keep them from being upgraded:

echo <pkgname> hold | sudo dpkg --set-selections

... We've done that for each of the four above packages. Going this
route does prevent the issue for now / keeps SSSD from failing.

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to cyrus-sasl2 in Ubuntu.
https://bugs.launchpad.net/bugs/1861230

Title:
  _sasl_plugin_load failed

Status in cyrus-sasl2 package in Ubuntu:
  New

Bug description:
  We are seeing the following in the journal after upgrading to these
  sets of packages:

  libsasl2-2/bionic-updates,bionic-security 2.1.27~101-g0780600+dfsg-3ubuntu2.1 
amd64
  libsasl2-modules/bionic-updates,bionic-security 
2.1.27~101-g0780600+dfsg-3ubuntu2.1 amd64
  libsasl2-modules-db/bionic-updates,bionic-security 
2.1.27~101-g0780600+dfsg-3ubuntu2.1 amd64 
  libsasl2-modules-gssapi-mit/bionic-updates,bionic-security 
2.1.27~101-g0780600+dfsg-3ubuntu2.1 

  Here are the errors:

  Jan 28 15:58:43 my-hostname sssd[20949]: Starting up
  Jan 28 15:58:43 my-hostname sssd[be[20950]: Starting up
  Jan 28 15:58:43 my-hostname sssd_be[20950]: ldapdb
  Jan 28 15:58:43 my-hostname sssd_be[20950]: _sasl_plugin_load failed on 
sasl_canonuser_init
  Jan 28 15:58:43 my-hostname sssd[be[20950]: No worthy mechs found
  Jan 28 15:58:43 my-hostname sssd[be[20950]: No worthy mechs found
  Jan 28 15:58:43 my-hostname sssd[be[20950]: No worthy mechs found
  Jan 28 15:58:43 my-hostname sssd[be[20950]: No worthy mechs found

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