This is a quick tip for all those who are using Sitecore.NET 8.0 rev. 150223 (8.0 Update 2) and facing hang issue while uploading Sitecore package.
Solution: There are two options to get rid of this issue. Option-1: Move to next upgrade as it is known issue and resolved in Sitecore 8.0 Update 3, you can find it at official release notes.
https://dev.sitecore.net/Downloads/Sitecore%20Experience%20Platform/8%200/Sitecore%20Experience%20Platform%2080%20Update3/Release%20notes But naturally this is not an easy solution. Option-2: This issue occurs when there is NO packages folder found under /Data folder at your Sitecore instance. So create packages folder manually under /Data folder in order to fix this issue. Thanks to my colleague Mahek who introduced me this issue. Enjoy your Sitecore Packaging now!