Yesterday I did the update to joomla 3.6 but with several errors.
On the upgrade I had this…
"1062 Duplicate entry '802' for key 'PRIMARY' SQL=INSERT INTO
#__extensions
(extension_id
, name
, type
, element
, folder
, client_id
, enabled
, access
, protected
, manifest_cache
, params
, custom_data
, system_data
, checked_out
, checked_out_time
, ordering
, state
) VALUES (802, 'English (United Kingdom)', 'package', 'pkg_en-GB', '', 0, 1, 1, 1, '', '', '', '', 0, '0000-00-00 00:00:00', 0, 0);"
After the upgrade, on the installation tab, I had this… (all plugins was enabled)
"No installation plugin has been enabled. At least one must be enabled to be able to use the installer. Go to the Plugin Manager to enable the plugins."
And in the front end I had some like this one…
"Warning: Invalid argument supplied for foreach() in....."
So today I used a backup (Akeba Backup) and restored the entire DB and files. Now the website is back on joomla 3.5.
Anyone have any idea what might have happened?