unable to run bash file

i created droplet of ubuntu 12.04 64bit and trying to install Network simulator. but when i run command ./install i got following error: -bash: ./install: permission denied any help will be appreciated! thank you

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There’s a few ways to execute the file. First, you can give it execution rights using:

chmod +x

and then run ./install or you can use:

bash ./install

Have you tried running it under sudo? So:

sudo ./install

If you are installing likely needs different permissions, if not I’d say confirm the requirements of your Network Simulator.