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How to solve the version issue of Bash in my Ubuntu?

I'm trying to execute a shell script in my Ubuntu VPN terminal.

My Bash version is:

GNU bash, version 4.3.46(1)-release (x86_64-pc-linux-gnu)

My shell script is:

#!/bin/bash
...
...

I have given permissions for it like so:

chmod +x _myscript.sh
ex -sc $'%s/\r$//e|x' _myscript.sh
sh _myscript.sh

I get this error:

syntax error in conditional expression: unexpected token `(‘

which is because of lower Bash version, I found out after doing research.

The solution I found was to add this line after Bash declaration:

[code language="bash"] shopt -s extglob [/code] 

I need to know where in the script i need to give the above line.

I tried just after #!/bin/bash in my script, but I still get the same error.

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    If it doesn't work as the first line after #!/bin/bash then I would say it isn't going to work, and you should show us your actual script? – Zanna Nov 24 '16 at 12:15
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    "unexpected token '(‘ which is because of lower bash version which i found by googling." - no, almost certainly it's because you ran the script using sh _myscript.sh - sh is not bash. See DashAsBinSh – steeldriver Nov 24 '16 at 12:50
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If you run a Bash script with the Bourne shell (sh), the shebang (#!/bin/bash) gets ignored, so sh runs the script, not bash. You need to run the script like this:

bash _myscript.sh

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