Cannot install Livy for Spark2 in HDP 3.0.0 / Ambari 2.7.0

[#1]

Installing Livy for Spark2 returns

Traceback (most recent call last):
  File "/var/lib/ambari-agent/cache/stack-hooks/before-ANY/scripts/hook.py", line 35, in <module>
    BeforeAnyHook().execute()
  File "/usr/lib/ambari-agent/lib/resource_management/libraries/script/script.py", line 353, in execute
    method(env)
  File "/var/lib/ambari-agent/cache/stack-hooks/before-ANY/scripts/hook.py", line 29, in hook
    setup_users()
  File "/var/lib/ambari-agent/cache/stack-hooks/before-ANY/scripts/shared_initialization.py", line 50, in setup_users
    groups = params.user_to_groups_dict[user],
KeyError: u'livy'
Error: Error: Unable to run the custom hook script ['/usr/bin/python', '/var/lib/ambari-agent/cache/stack-hooks/before-ANY/scripts/hook.py', 'ANY', '/var/lib/ambari-agent/data/command-3302.json', '/var/lib/ambari-agent/cache/stack-hooks/before-ANY', '/var/lib/ambari-agent/data/structured-out-3302.json', 'INFO', '/var/lib/ambari-agent/tmp', 'PROTOCOL_TLSv1_2', '']

Checked the apache JIRA and found that it should have already been fixed: https://issues.apache.org/jira/browse/AMBARI-24021

[#2]

@Jay Kumar SenSharma

Can you help out on this?

Many thanks!

[#3]

@Daniel K

I did a clean install last night and it was all successful, in HDP 3.0 during the account configuration you need to setup users like attached did you do that?

[#4]

@Geoffrey Shelton Okot

My installation is not a fresh one. It is an upgrade from HDP 2.6.4 to 3.0 and Ambari from 2.6.1 to 2.7.0.

Any idea?