Description of problem:

"sudo apt-get upgrade ceph-ansible" tries to upgrade ceph packages along with ceph-ansible and errors out. Needs command change in 3.x ubuntu upgrade guide as mentioned below:

From:
If upgrading from Ceph 3.x to the latest version, on the Ansible administration node, ensure the latest version of the ceph-ansible package is installed.

[root@admin ~]$ sudo apt-get upgrade ceph-ansible

To: 
From:
If upgrading from Ceph 3.x to the latest version, on the Ansible administration node, ensure the latest version of the ceph-ansible package is installed.

[root@admin ~]$ sudo apt-get install ceph-ansible

Additional info:

Can combine this change with the previous point in the upgrade guide since both will use same command. ie "sudo apt-get install ceph-ansible"