unable to install Error: Duplicate entry 'tags' for key 'machine_name'

Problem/Motivation

Unable to install (on AEgir) : throws errror:
[previous:Exception:private] =>
[errorInfo] => Array
(
[0] => 23000
[1] => 1062
[2] => Duplicate entry 'tags' for key 'machine_name'
)

[query_string] => INSERT INTO {taxonomy_vocabulary} (name, machine_name, description, module) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3)
[args] => Array
(
[:db_insert_placeholder_0] => Tags
[:db_insert_placeholder_1] => tags
[:db_insert_placeholder_2] => Use tags to group articles on similar topics into categories.
[:db_insert_placeholder_3] => taxonomy

Steps to reproduce

just trying to install normally - Does anyone know a workaround? Can I change the machine_name of "tags" to"core-tags" or something like that and get install to work? What file is that done in? I have looked and looked and can't find it!

I am trying to restore a working site that I lost when entire server went down! Thanks for any help or tips!

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes