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Mandatory information about my setup:

Have I read the related troubleshooter articles above before posting (which pages?)? Course I did.
Have I searched the tickets before posting? Yes
Have I read the documentation before posting (which pages?)? Oh yes.
Joomla! version: 1.5.23
PHP version: 5.3.2
MySQL version: 5.1.x
Host: Linode
Admin Tools version: 2.0.5

Description of my issue:

Strangely, ATP is complaining about php-curl nit being installed / enabled, when it clearly is.

cURL support 	enabled
cURL Information 	7.19.7
Age 	3 

Moreover:

root@li310-121:~# apt-get install php5-curl
Reading package lists... Done
Building dependency tree       
Reading state information... Done
php5-curl is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
root@li310-121:~# php -v
PHP Deprecated:  Comments starting with '#' are deprecated in /etc/php5/cli/conf.d/mcrypt.ini on line 1 in Unknown on line 0
PHP 5.3.2-1ubuntu4.15 with Suhosin-Patch (cli) (built: May  4 2012 00:38:52) 
Copyright (c) 1997-2009 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies

(I knew it was there all along, but ran the command just to make sure)

Additional data:
Ubuntu 10.04
Apache 2.2.x

There's no firewall of any kind in this particular environment either.

Juat a quicky to let you know that I have just upgraded Ubuntu to the latest LTS release, 12.04.
Same issue, though.

Ha| A manual upgrade to ATP 2.2.5 solved the issue.
You may close this ticket.

The error was thrown when I attempted to upgrade ATP from 2.0.5.
The verbose read:

"Your server indicates that Live Update is not supported. Please contact your host and ask them to enable the cURL PHP extension or activate the URL fopen() wrappers. If these are already enabled, please ask them to configure their firewall so that it allows access to the following URL:";