J3.x:Select Type Field Missing in Extensions Manage

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Errors reported

The Select Type field is missing in Extensions    Manage   Manage for updated sites. The field is displayed on fresh installs.

Versions affected

General Information

This pertains only to Joomla! version(s): 3.8.10

What is the cause

The file /administrator/components/com_installer/models/fields/type.php is being deleted from sites during the post-update processing.

How to fix

Update to Joomla 3.8.11 or re-install the file: https://github.com/joomla/joomla-cms/blob/staging/administrator/components/com_installer/models/fields/type.php in /administrator/components/com_installer/models/fields/