Ubuntu
******

.. highlight:: html

debsums
=======

debsums_ is a useful utility to validate packages in a ubuntu or debian system.

Usage::

  sudo debsums -c

If this identifies any problems you can fix them using.::

  sudo apt install --reinstall <package name>

If debsums idenfifies several packages with issues, to fix all of them use::

  sudo apt install --reinstall $(dpkg -S $(debsums -c) | cut -d : -f 1 | sort -u)

For more information there is a `useful post about debsums on askubuntu`_

Upgrade to 20.04
================

::

  do-release-upgrade

.. tip:: If 20.04.1 is still not released when you run this command, then you
         can upgrade using ``do-release-upgrade -d``.

.. tip:: Just so you remember,
         *an additional SSH daemon will be started at port '1022'*.

- Select the recommended option for the *LXD snap track* i.e. version ``4.0``

This message was displayed at the end of the upgrade:

.. image:: ./misc/2020-09-22-azure-grub-failed-install.png

I clicked *Yes* to continue, and all was well.

Salt
----

Uninstall Salt (Master and Minion)...

Update::

  # /etc/apt/sources.list.d/saltstack.list:
  deb http://repo.saltstack.com/py3/ubuntu/20.04/amd64/latest focal main

Re-install Salt

.. _ubuntu-postgres-upgrade-cluster:

Postgres Upgrade Cluster
------------------------

To move the data from Postgres 10 to 12, run the following as ``root``::

  # list the clusters
  pg_lsclusters

  # drop the new (empty) cluster
  pg_dropcluster 12 main --stop
  # migrate the data from 10 to 12
  pg_upgradecluster 10 main

  # remove the 10 cluster
  pg_dropcluster 10 main --stop

  # remove the old database engine
  apt remove postgresql-10

  # list the clusters
  pg_lsclusters
  Ver Cluster Port Status Owner    Data directory              Log file
  10  main    5432 online postgres /var/lib/postgresql/10/main /var/log/postgresql/postgresql-10-main.log

For more information, see Postgres :ref:`postgres-upgrade-cluster` ...

LetsEncrypt
-----------

For Ubuntu 20.04, we are using the ``certbot`` package::

  rm -rf /opt/letsencrypt

For more information, see the ``diff``:
`Use 'certbot' package (rather than letsencrypt git repo)`_


.. _`Use 'certbot' package (rather than letsencrypt git repo)`: https://gitlab.com/kb/salt/-/commit/b42453ce8f0c3af436bf91ff0aa4e79a497bb05f
.. _`useful post about debsums on askubuntu`: http://askubuntu.com/questions/57682/find-and-reinstall-packages-with-corrupted-files-without-breaking-anything