Ubuntu, why does the root permission not execute. bin file? __ubuntu

Recently, to learn about Linux's Java development environment, also in order to make full use of my 64-bit CPU resources, down from the internet down an Ubuntu down (just a search to know that this version is now the hottest), do not ask why not 64-bit "plague beans die", Ghosts know now 64 "plague beans Die" Under the less pathetic application.
But this dongdong is quite good to install, almost all the way "Next" down on the finished, but also with the N input method, the network is also very good with (these dongdong from the http://ubuntu.org.cn on the casual look for it). But the next thing can be a bit annoying, generally 64-bit dongdong will have some problems.
N years ago used a "red hat", think that Dongdong version is quite good to use, but now people want money, we did not have to flash.

Originally installed Dongdong can be used as long as the root permissions, but the execution. bin file always say no permissions, and then search the Internet from the N, said to use root as a direct login execution on line (sudo passwd) first to change the root password, and then log in as root. KK, or not, still do not have permission. Search on the Internet for n minutes, finally found an article said Ubuntu in order to prevent the arbitrary use of root login to avoid misoperation caused by the system damage, the root of the authority to remove, then the line, I give it to add on it.

OK, now use chmod a+x path/bin_file_name.bin and then do it.

However, there are a lot of problems under 64, slowly study it, I hope 64 early open the door. A... M...