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Pike notes

The Pike release in Ubuntu comes with the new Luminous Ceph release, so first upgrade that. Make sure the sortbitwise flag is set in the Ceph cluster before upgrade! (ceph osd set sortbitwise). This will not migrate to bluestore!
The default user used by the installer has changed from 'ansible' to 'ubuntu'.
~~Migrations fail probably because the image locking feature introduced in Qemu 2.10. https://bugs.launchpad.net/ubuntu/+source/nova/+bug/1718133~~ A fix was released.

The upgrade from Newton is not so smooth, so please read the Newton->Ocata section of the upgrade doc before doing it.

Horizon with python-openssl installed often throws SSLError: ('bad handshake SysCallError(0, None)), when the OpenStack endpoints are TLS secured. The workaround is to remove python-openssl, but this is required by other packages. To solve this issue, install Horizon to a separate machine (an lxd container can be a good cheap choice), and remove python-openssl after the installation finished. Update: downgrading python-cryptography and python-openssl to the version shipped with Mitaka seems to work.
~~http://ubuntu-cloud.archive.canonical.com/ubuntu/pool/main/p/pyopenssl/python-openssl_0.15.1-2build1~cloud0_all.deb~~
~~http://ubuntu-cloud.archive.canonical.com/ubuntu/pool/main/p/python-cryptography/python-cryptography_1.2.3-1~cloud0_amd64.deb~~

This issue is fixed with WSGIApplicationGroup %{GLOBAL} in Apache.

Magnum package misses the alembic stuff. The package itself is corrected in the cloud archive, however the package index is not. Workaround: after the installer bails out with an error during Magnum install, upgrade manually with the 3.1.1-1~cloud0_all versions from http://ubuntu-cloud.archive.canonical.com/ubuntu/pool/main/m/magnum/ The python-magnum package is fixed.
Neutron LBaaS v1 package is broken, so the default is now the LBaaS v2. Unfortunately, Ubuntu doesn't ship the Horizon dashboard for LBaaS v2.
~~Nova has a problem with URLs with dash (-) in them. The workaround is to upgrade the python-rfc3986 package to at least 0.3.1. This is available from the Debian testing repo.~~ New, fixed python-rfc3986 package is released in Ubuntu Xenial.