Hi There,

The diff between MAAS 2.3.4 and 2.3.5 is available here [1]. As you can
see, there hasn't been any changes related to the problem you are
experiencing.

What does seem to be the error is this:

    from provisioningserver.drivers.pod.rsd import RSDPodDriver
  File "/usr/lib/python3/dist-packages/provisioningserver/drivers/pod/rsd.py", 
line 40, in <module>
    from twisted.internet._sslverify import (
  File "/usr/lib/python3/dist-packages/twisted/internet/_sslverify.py", line 
14, in <module>
    import OpenSSL
ImportError: No module named 'OpenSSL'

It would seem  as if twisted has a missing module. Since twisted in
Xenial has not been changed in months [2], I wonder if you have
installed a twisted that doesn't come from the archive, or, is the
system broken?

Also, I looked at a system where I installed 2.3.5, and looked at
twisted to see if it depends on python3-ssl, and I was able to find
this:

root@xenial-maas:~# apt-cache rdepends python3-openssl
python3-openssl
Reverse Depends:
  [...]
  python-openssl-doc
  python3-urllib3
  python3-twisted
  [...]

Which correctly tells me that twisted depends on openssl, which is the
missing library. I would think either you are customizing anything
that's not standard, or your system is broken elsewhere, which causes
the upgrade issue.

[1]: 
https://launchpadlibrarian.net/383918404/maas_2.3.4-6508-g4f77e30-0ubuntu1~16.04.1_2.3.5-6511-gf466fdb-0ubuntu1~16.04.1.diff.gz
[2]: https://launchpad.net/ubuntu/+source/twisted

** Changed in: maas (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1788585

Title:
  MAAS Upgrade Failed 2.3.4 to 2.3.5 (PPA/Stable)

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