instal.sh ubuntu

masuk ke direktori folder

1. Tried; sudo ./install.sh
sudo: ./install.sh: command not found
2. Trying to remount the installation disk with exec permission;
   mount /media/user/IFORTRAN2011 -o remount,exec
3. Trying to change install.sh to executable;
   chmod +x ./install.sh
4. Tried; su -c 'install.sh'

with root:

bash: install.sh: command not found

with user:

Password: 
su: Authentication failure

and I am sure the password is true. (If it is the same with my user password)
5 . I copied the disk into a folder than compressed it into

file.tar.gz

than extract it with

tar xvzf file.tar.gz

then tried everthing again. No luck.
After I did chmod +x ./install.sh when I look the permissions with: ls -l ./install.sh it still gives: -rw------- 1 user user 14758 Oct 7 2010 ./install.sh
Thanks for any help.