Lỗi cài đặt virtualmart there was an error uploading this file to the server

You need to increase upload_max_filesize in your server php.ini as it is probably still set at the 2Mb default value.

If you are anable to edit this file then there are alternative installation methods. See the VirtueMart wiki:
http://virtuemart.net/index.php?option=com_content&task=view&id=322&Itemid=152

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