My problem is that when I downloaded an image, Linux (Ubuntu distr.) doesn't recognizes it as an image
Linux is not an image viewer - how exactly did you try to open it? What's the output of file $image.jpg (use a real image name)?
My guess is that your regex doesn't work as you expect it to, $1 contains an invalid URL and you get an error page mirrored.
Did you try to print the matched URLs to STDOUT?
And try this regex:
$content =~ m{<tr><td><img src="([^"]+)" alt="php-image" /></td></tr>}
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